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Financial Instruments (Details)
€ in Millions, ¥ in Millions, £ in Millions, SFr in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Feb. 28, 2015
USD ($)
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
EUR (€)
Sep. 30, 2016
CHF (SFr)
Sep. 30, 2016
GBP (£)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
JPY (¥)
May 31, 2016
CHF (SFr)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
EUR (€)
Jun. 02, 2015
USD ($)
Mar. 31, 2015
USD ($)
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized                       $ 685.9     $ 670.6      
Interest Expense     $ 47.2   $ 39.3   $ 133.8 $ 117.0                    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax                       138.8     68.0      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax                       7.6     52.5      
Available-for-sale Securities, Gross Realized Gains     12.8   151.0   18.0 253.3                    
Repayments of Long-term Debt             0.2 1,950.6                    
Available-for-sale Securities, Debt Securities                       $ 4,860.5            
Proceeds from issuance of long-term debt             1,206.6 4,454.6                    
Extinguishment of Debt, Amount               1,650.0                    
Debt extinguishment loss     $ 0.0   0.0 $ 166.7 $ 0.0 166.7                    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Percentage of Nonperforming Assets             90.00%                      
Maximum Remaining Maturity of Foreign Currency Derivatives     30 days                              
Description of Derivative Activity Volume Percent                 30.00% 30.00% 30.00% 30.00% 30.00%          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net                       $ 15.2            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability             $ 171.8                      
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value                       3,716.5            
Available-for-sale Securities, Continuous Unrealized Gain Position, Fair Value                       3,570.3     764.5      
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value                       1,266.2     2,933.4      
Other than Temporary Impairment Losses, Investments     $ 11.4   31.5   53.0 41.3                    
Proceeds from Sale and Maturity of Available-for-sale Securities     926.3   621.9   2,503.4 3,491.8                    
Available-for-sale Securities, Gross Realized Losses     1.3   1.5   11.7 3.9                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value                       737.8            
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value                       171.8            
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value                       234.4            
Net payments for terminations of interest rate swaps             (3.4) (186.1)                    
Investment Income, Interest     29.1   21.2   76.8 63.2                    
Foreign Currency Transaction Gain (Loss), Realized     0.0 $ (203.9) 0.0   (203.9) 0.0                    
Other Nonoperating Income (Expense)     45.3   104.6   160.3 276.4                    
Nonoperating Income (Expense)     27.2   86.5   (100.6) 55.9                    
Maturity Date, 2018 [Member]                                    
Long-term Debt                           SFr (200.0)       $ (600.0)
Debt Instrument, Interest Rate, Stated Percentage                           0.00%       1.25%
Maturity Date, 2024 [Member]                                    
Long-term Debt | SFr                           SFr (600.0)        
Debt Instrument, Interest Rate, Stated Percentage                           0.15%        
Maturity Date, 2028 [Member]                                    
Long-term Debt | SFr                           SFr (400.0)        
Debt Instrument, Interest Rate, Stated Percentage                           0.45%        
Maturity Date, 2025 [Member]                                    
Long-term Debt                                   $ (800.0)
Debt Instrument, Interest Rate, Stated Percentage                                   2.75%
Maturity Date, 2045 [Member]                                    
Long-term Debt                                   $ (800.0)
Debt Instrument, Interest Rate, Stated Percentage                                   3.70%
Maturity Date, 2022 [Member]                                    
Long-term Debt | €                               € (600.0)    
Debt Instrument, Interest Rate, Stated Percentage                               1.00%    
Maturity Date, 2026 [Member]                                    
Long-term Debt | €                               € (750.0)    
Debt Instrument, Interest Rate, Stated Percentage                               1.63%    
Maturity Date, 2030 [Member]                                    
Long-term Debt | €                               € (750.0)    
Debt Instrument, Interest Rate, Stated Percentage                               2.13%    
Euro-Denominated Debt Issuance [Member]                                    
Proceeds from issuance of long-term debt               2,270.0                    
Swiss Franc-Denominated Debt Issuance [Member]                                    
Proceeds from issuance of long-term debt             1,210.0                      
Net Investment Hedging [Member]                                    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     (37.0)   (16.8)   (80.0) (50.6)                    
Foreign Currency Denominated Debt [Member]                                    
Long-term Debt                       (3,550.0)     (2,270.0)      
Cross Currency Interest Rate Contract [Member] | Net Investment Hedging [Member]                                    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     (4.1)   0.0   2.2 0.0                    
Interest Rate Swap [Member]                                    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     0.0   0.0   (3.4) (56.7)                    
Buy British pound Sell euro [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Derivative Liability, Notional Amount | £                     £ 192.7              
Derivative Asset, Notional Amount | €                 € 225.2                  
Buy US dollar Sell euro [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Derivative Liability, Notional Amount                       946.7            
Derivative Asset, Notional Amount | €                 844.8                  
Buy euro Sell US dollar [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Derivative Liability, Notional Amount | €                 € 1,790.0                  
Derivative Asset, Notional Amount                       2,000.0            
Buy US dollar Sell Japanese Yen [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Derivative Liability, Notional Amount                       742.5            
Derivative Asset, Notional Amount | ¥                         ¥ 75,420          
Buy US dollar Sell British pound [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Derivative Liability, Notional Amount                       266.9            
Derivative Asset, Notional Amount | £                     £ 204.2              
Buy Swiss francs Sell US dollar [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Derivative Liability, Notional Amount | SFr                   SFr 192.8                
Derivative Asset, Notional Amount                       196.9            
Equity Contract [Member]                                    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     0.0       0.0                      
Hedged Fixed Rate Debt [Member] | Designated as Hedging Instrument [Member]                                    
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge     (18.8)   66.1   92.4 25.8                    
Interest Rate Contract [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Derivative Liability, Notional Amount   $ 1,350.0                                
Derivative Asset, Notional Amount                                 $ 876.0  
Net payments for terminations of interest rate swaps $ (20.2) $ (206.3)                                
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]                                    
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments     18.8   (66.1)   (92.4) (25.8)                    
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion     3.8   3.7   11.2 10.0                    
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]                                    
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments     1.4   (14.9)   105.6 7.2                    
Foreign Exchange Contract [Member] | Net Investment Hedging [Member]                                    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net     $ 0.0   $ 0.0   $ 31.9 0.0                    
Estimate of Fair Value Measurement [Member]                                    
Cash and Cash Equivalents, Fair Value Disclosure                       1,615.9     1,644.4      
Long-term Debt                       (10,064.6)     (8,172.0)      
Estimate of Fair Value Measurement [Member] | Not Designated as Hedging Instrument [Member]                                    
Business Combination, Contingent Consideration, Liability, Current [1]                       (235.0)     (243.7)      
Business Combination, Contingent Consideration, Liability, Noncurrent [1]                       (296.2)     (427.2)      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]                                    
Cash and Cash Equivalents, Fair Value Disclosure                       1,614.8     1,637.0      
Long-term Debt                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Not Designated as Hedging Instrument [Member]                                    
Business Combination, Contingent Consideration, Liability, Current [1]                       0.0     0.0      
Business Combination, Contingent Consideration, Liability, Noncurrent [1]                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]                                    
Cash and Cash Equivalents, Fair Value Disclosure                       1.1     7.4      
Long-term Debt                       (10,064.6)     (8,172.0)      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]                                    
Business Combination, Contingent Consideration, Liability, Current [1]                       0.0     0.0      
Business Combination, Contingent Consideration, Liability, Noncurrent [1]                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]                                    
Cash and Cash Equivalents, Fair Value Disclosure                       0.0     0.0      
Long-term Debt                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member]                                    
Business Combination, Contingent Consideration, Liability, Current [1]                       (235.0)     (243.7)      
Business Combination, Contingent Consideration, Liability, Noncurrent [1]                       (296.2)     (427.2)      
Estimate of Fair Value Measurement [Member] | Corporate Debt Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       648.8     625.8      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       3,104.7     1,962.6      
Estimate of Fair Value Measurement [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       0.0     0.0      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       648.8     625.8      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       3,104.7     1,962.6      
Estimate of Fair Value Measurement [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       0.0     0.0      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | US Government Agencies Debt Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       81.0     153.2      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       344.0     284.5      
Estimate of Fair Value Measurement [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       81.0     153.2      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       344.0     283.5      
Estimate of Fair Value Measurement [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       0.0     0.0      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     1.0      
Estimate of Fair Value Measurement [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       0.0     0.0      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       2.7     3.1      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       170.1     137.1      
Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       0.0     0.0      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       2.7     3.1      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       3.4     4.1      
Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       0.0     0.0      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       166.7     133.0      
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       195.8     153.3      
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       195.8     153.3      
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Asset-backed Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       5.3     3.3      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       474.8     441.9      
Estimate of Fair Value Measurement [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       0.0     0.0      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       5.3     3.3      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       474.8     441.9      
Estimate of Fair Value Measurement [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       0.0     0.0      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Equity Securities, US [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Equity Securities, Noncurrent                       178.5     128.9      
Estimate of Fair Value Measurement [Member] | Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Equity Securities, Noncurrent                       178.5     128.9      
Estimate of Fair Value Measurement [Member] | Equity Securities, US [Member] | Fair Value, Inputs, Level 2 [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Equity Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Equity Securities, US [Member] | Fair Value, Inputs, Level 3 [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Equity Securities, Noncurrent                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Noncurrent                       1.6            
Estimate of Fair Value Measurement [Member] | Cross Currency Interest Rate Contract [Member] | Fair Value, Inputs, Level 1 [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Noncurrent                       0.0            
Estimate of Fair Value Measurement [Member] | Cross Currency Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Noncurrent                       1.6            
Estimate of Fair Value Measurement [Member] | Cross Currency Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Noncurrent                       0.0            
Estimate of Fair Value Measurement [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       5.8            
Derivative Assets, Noncurrent                       156.2     70.1      
Derivative Liabilities, Noncurrent                             (0.4)      
Estimate of Fair Value Measurement [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 1 [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       0.0            
Derivative Assets, Noncurrent                       0.0     0.0      
Derivative Liabilities, Noncurrent                             0.0      
Estimate of Fair Value Measurement [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       5.8            
Derivative Assets, Noncurrent                       156.2     70.1      
Derivative Liabilities, Noncurrent                             (0.4)      
Estimate of Fair Value Measurement [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       0.0            
Derivative Assets, Noncurrent                       0.0     0.0      
Derivative Liabilities, Noncurrent                             0.0      
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       8.4     13.1      
Derivative Liabilities, Current                       (5.5)     (17.3)      
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] | Not Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       0.0     0.0      
Derivative Liabilities, Current                       0.0     0.0      
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       8.4     13.1      
Derivative Liabilities, Current                       (5.5)     (17.3)      
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       0.0     0.0      
Derivative Liabilities, Current                       0.0     0.0      
Reported Value Measurement [Member]                                    
Cash and Cash Equivalents, Fair Value Disclosure                       1,615.9     1,644.4      
Long-term Debt                       (9,348.8)     (7,978.5)      
Extinguishment of Debt, Amount               $ 1,780.0                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Current, Total                       737.8     785.4      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Noncurrent, Total                       5,027.0     3,646.6      
Reported Value Measurement [Member] | Not Designated as Hedging Instrument [Member]                                    
Business Combination, Contingent Consideration, Liability, Current [1]                       (235.0)     (243.7)      
Business Combination, Contingent Consideration, Liability, Noncurrent [1]                       (296.2)     (427.2)      
Reported Value Measurement [Member] | Corporate Debt Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       648.8     625.8      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       3,104.7     1,962.6      
Reported Value Measurement [Member] | US Government Agencies Debt Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       81.0     153.2      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       344.0     284.5      
Reported Value Measurement [Member] | Other Debt Obligations [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       2.7     3.1      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       170.1     137.1      
Reported Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       195.8     153.3      
Reported Value Measurement [Member] | Asset-backed Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current                       5.3     3.3      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent                       474.8     441.9      
Reported Value Measurement [Member] | Equity Securities, US [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Equity Securities, Noncurrent                       178.5     128.9      
Reported Value Measurement [Member] | Equity Method and Other Investments [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Other Long-term Investments [2]                       559.1     538.3      
Reported Value Measurement [Member] | Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Noncurrent                       1.6            
Reported Value Measurement [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       5.8            
Derivative Assets, Noncurrent                       156.2     70.1      
Derivative Liabilities, Noncurrent                             (0.4)      
Reported Value Measurement [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]                                    
Derivative Assets, Current                       8.4     13.1      
Derivative Liabilities, Current                       (5.5)     (17.3)      
Portion at Other than Fair Value Measurement [Member]                                    
Cash and Cash Equivalents, Fair Value Disclosure [3]                       1,615.9     1,644.4      
Portion at Other than Fair Value Measurement [Member] | Corporate Debt Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current [3]                       648.3     626.9      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent [3]                       3,084.7     1,995.8      
Portion at Other than Fair Value Measurement [Member] | US Government Agencies Debt Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current [3]                       81.0     153.4      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent [3]                       342.0     286.0      
Portion at Other than Fair Value Measurement [Member] | Other Debt Obligations [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current [3]                       2.7     3.1      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent [3]                       82.6     97.3      
Portion at Other than Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent [3]                       193.7     154.7      
Portion at Other than Fair Value Measurement [Member] | Asset-backed Securities [Member]                                    
Available-for-sale Securities, Current [Abstract]                                    
Available-for-sale Securities, Debt Securities, Current [3]                       5.3     3.3      
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Debt Securities, Noncurrent [3]                       473.3     443.1      
Portion at Other than Fair Value Measurement [Member] | Equity Securities, US [Member]                                    
Available-for-sale Securities, Noncurrent [Abstract]                                    
Available-for-sale Securities, Equity Securities, Noncurrent [3]                       $ 80.5     $ 74.8      
[1] (1) Contingent consideration liabilities primarily relate to the Erbitux arrangement with BMS discussed in Note 4.
[2] (2) Fair value disclosures are not applicable for cost method and equity method investments.
[3] (1) For available-for-sale debt securities, amounts disclosed represent the securities' amortized cost.