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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Derivative [Line Items]        
Remaining maturity of forward foreign exchange contracts, maximum 18 months      
Unrealized losses in AOCI at time of de-designation $ (2,794.6) $ (2,660.0) $ (2,921.9) $ (3,156.9)
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months 0.3      
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months 47.2      
Interest Rate Swap        
Derivative [Line Items]        
Derivative transaction $ 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 211.2      
Gross amount of swaps in an liability position subject to master netting arrangement 236.3      
Net asset of swaps subject to master netting arrangement 50.8      
Net liability of swaps subject to master netting arrangement $ 75.9      
Minimum | Interest Rate Swap        
Derivative [Line Items]        
Extended maturity 2 years      
Maximum | Interest Rate Swap        
Derivative [Line Items]        
Extended maturity 5 years      
Not Designated as Hedging Instrument | Interest Rate Swap        
Derivative [Line Items]        
Notional amount entered into during period $ 1,400.0      
Designated as Hedging Instrument | Interest Rate Swap        
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 Swap        
Derivative [Line Items]        
Unrealized losses in AOCI at time of de-designation   $ 163.0