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Financial Instruments (Narrative) (Details)
€ in Millions, ¥ in Millions, £ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
JPY (¥)
Dec. 31, 2020
GBP (£)
Derivative [Line Items]            
Average remaining maturity of foreign currency derivatives 12 months          
Maximum remaining maturity of foreign currency derivatives 30 days          
Total long-term notes $ 16,348.7 $ 13,638.5        
Foreign currency-denominated notes, designated as hedge $ 4,500.0 4,100.0        
Variable rate 9.00%     9.00% 9.00% 9.00%
Losses expected to be reclassified in the next 12 months $ 16.8          
Unfunded commitments to invest in venture capital funds $ 687.0          
Unfunded commitments to invest in venture capital funds, anticipated payment period 10 years          
Unrealized losses from equity securities $ 1,442.2 401.2 $ 72.6      
Percentage of nonperforming assets 86.00%          
Accounts receivable derecognized $ 754.9 678.8        
Buy USD Sell Euro            
Derivative [Line Items]            
Derivative liability, notional amount 647.9          
Derivative asset, notional amount | €       € 530.7    
Buy Euro Sell USD            
Derivative [Line Items]            
Derivative liability, notional amount | €       € 2,970.0    
Derivative asset, notional amount 3,620.0          
Buy USD Sell Japanese Yen            
Derivative [Line Items]            
Derivative liability, notional amount 180.7          
Derivative asset, notional amount | ¥         ¥ 18,640  
Buy GBP Sell USD            
Derivative [Line Items]            
Derivative liability, notional amount | £           £ 272.2
Derivative asset, notional amount 363.9          
Currency Swap            
Derivative [Line Items]            
Derivative liability, notional amount 3,760.0          
Swap Swiss Francs to USD            
Derivative [Line Items]            
Derivative liability, notional amount 1,000.0          
Foreign Currency Denominated Debt            
Derivative [Line Items]            
Total long-term notes 6,020.0 $ 5,490.0        
Cash flow hedges | Designated as Hedging Instrument | Forward-starting interest rate swaps            
Derivative [Line Items]            
Derivative, notional amount $ 1,750.0