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Financial Instruments (Narrative) (Details)
€ in Millions, ¥ in Millions, £ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
JPY (¥)
Jun. 30, 2020
GBP (£)
May 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Maximum remaining maturity of foreign currency derivatives     30 days            
Derivatives used in net investment hedge, net of tax $ 4,100.0   $ 4,100.0           $ 4,100.0
Percentage of long-term fixed-rate notes to floating rates through the use of interest rate swaps converted 10.00%   10.00%   10.00% 10.00% 10.00%    
Pretax net losses on cash flow hedges expected to be reclassified during the next 12 months $ 16.5   $ 16.5            
Equity securities, net unrealized gains and (losses) 577.5 $ 6.3 $ 742.2 $ 156.0          
Available-for-sale, percentage of nonperforming assets     86.00%            
Amount of receivable derecognized 738.9   $ 738.9           678.8
Buy U.S. Dollars Sell Euros                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative liability, notional amount 1,090.0   1,090.0            
Derivative asset, notional amount | €         € 971.6        
Buy Euros Sell U.S. Dollars                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative liability, notional amount | €         € 1,610.0        
Derivative asset, notional amount 1,820.0   1,820.0            
Buy U.S. Dollars Sell Japanese Yen                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative liability, notional amount 268.0   268.0            
Derivative asset, notional amount | ¥           ¥ 28,710      
Buy British Pounds and Sell U.S. Dollars                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative liability, notional amount | £             £ 245.2    
Derivative asset, notional amount 307.9   307.9            
Swap U.S. Dollars to Euro                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative, notional amount 2,560.0   2,560.0            
Swap Swiss Francs to U.S. Dollars                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative, notional amount 1,000.0   1,000.0            
Swap U.S. Dollars to British Pounds                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative, notional amount 125.0   125.0            
Foreign Currency Denominated Debt                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Long-term debt, including current portion 5,530.0   5,530.0           $ 5,490.0
Senior Notes Due April 2050 | Senior Notes                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt instrument, face amount               $ 1,000.0  
Stated interest rate               2.25%  
Designated as Hedging Instrument | Cash Flow Hedging | Forward-starting interest rate swaps                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative, notional amount $ 1,750.0   $ 1,750.0