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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Derivative [Line Items]            
Remaining maturity of forward foreign exchange contracts, maximum 13 months          
Unrealized losses in AOCI at time of de-designation $ (2,747.1) $ (2,714.3) $ (2,660.0) $ (2,796.3) $ (2,842.3) $ (2,921.9)
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months 1.3          
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months 47.7          
Interest rate swaps            
Derivative [Line Items]            
Interest rate swaps, modification, notional amount $ 1,400.0          
Fixed pay rate 2.25%   2.87%      
Notional amount, de-designated $ 1,400.0          
Gross amount of swaps in an asset position subject to master netting arrangement 165.8          
Gross amount of swaps in an liability position subject to master netting arrangement 261.6          
Net asset of swaps subject to master netting arrangement 9.9          
Net liability of swaps subject to master netting arrangement $ 105.7          
Minimum | Interest rate swaps            
Derivative [Line Items]            
Extended maturity 2 years          
Maximum | Interest rate swaps            
Derivative [Line Items]            
Extended maturity 5 years          
Not Designated as Hedging Instrument | Interest rate swaps            
Derivative [Line Items]            
Notional amount entered into during period $ 1,400.0          
Designated as Hedging Instrument | Interest rate swaps            
Derivative [Line Items]            
Notional amount entered into during period $ 1,400.0          
Accumulated Gain (Loss), Net, Cash Flow Hedge Discontinued, Including Noncontrolling Interest | Interest rate swaps            
Derivative [Line Items]            
Unrealized losses in AOCI at time of de-designation     $ 163.0