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Financial Instruments (Narrative) (Details)
€ in Millions, ¥ in Millions, £ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
JPY (¥)
Dec. 31, 2021
GBP (£)
Derivative [Line Items]            
Average remaining maturity of foreign currency derivatives 12 months          
Maximum remaining maturity of foreign currency derivatives 180 days          
Total long-term notes $ 16,741.2 $ 16,348.7        
Foreign currency-denominated notes, designated as hedge $ 5,790.0 4,500.0        
Variable rate 13.00%     13.00% 13.00% 13.00%
Losses expected to be reclassified in the next 12 months $ 16.5          
Unfunded commitments to invest in venture capital funds $ 828.0          
Unfunded commitments to invest in venture capital funds, anticipated payment period 10 years          
Net investment gains on equity securities $ 176.9 1,442.2 $ 401.2      
Percentage of nonperforming assets 97.00%          
Accounts receivable derecognized $ 550.5 754.9        
Buy USD Sell Euro            
Derivative [Line Items]            
Derivative liability, notional amount 4,430.0          
Derivative asset, notional amount | €       € 3,920    
Buy Euro Sell USD            
Derivative [Line Items]            
Derivative liability, notional amount | €       € 3,840    
Derivative asset, notional amount 4,370.0          
Buy USD Sell Japanese Yen            
Derivative [Line Items]            
Derivative liability, notional amount 159.2          
Derivative asset, notional amount | ¥         ¥ 18,260  
Buy GBP Sell USD            
Derivative [Line Items]            
Derivative liability, notional amount | £           £ 223.0
Derivative asset, notional amount 296.0          
Currency Swap            
Derivative [Line Items]            
Derivative liability, notional amount 1,020.0          
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 7,900.0 $ 6,020.0        
Cash flow hedges | Designated as Hedging Instrument | Forward-starting interest rate swaps            
Derivative [Line Items]            
Derivative, notional amount $ 1,750.0