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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
May 31, 2022
May 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Derivative [Line Items]            
Remaining maturity of forward foreign exchange contracts, maximum     30 months      
Reduction of asset value of derivative $ 188.7   $ (188.7) $ 0.0 $ 0.0  
Unrealized gains in AOCI at time of termination     (786.0) (2,683.4) (2,794.6) $ (2,660.0)
Net Cash Provided by (Used in) Operating Activities     (114.3) (660.9) (0.5)  
Net Cash Provided by (Used in) Financing Activities     (63.8) (599.4) (237.9)  
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months     2.9      
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months     23.5      
Interest Rate Swap            
Derivative [Line Items]            
Proceeds from terminated swaps 56.4          
Reduction of debt host 131.3 $ (3.2)        
Net Cash Provided by (Used in) Operating Activities 188.7          
Net Cash Provided by (Used in) Financing Activities 134.5          
Gross amount of swaps in an asset position subject to master netting arrangement       169.6    
Gross amount of swaps in an liability position subject to master netting arrangement       147.3    
Net asset of swaps subject to master netting arrangement       32.0    
Net liability of swaps subject to master netting arrangement       9.8    
Notional amount, de-designated         1,400.0  
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     1,700.0 1,700.0    
Derivative Liability 6.8 6.8        
Designated as Hedging Instrument | Interest Rate Swap | Interest Rate Swaps, Re-designated Swaps            
Derivative [Line Items]            
Notional amount     1,400.0      
Designated as Hedging Instrument | Interest Rate Swap | Interest Rate Swap, Fixed Rate Paid 2.915%, Effective Date May 23, 2018            
Derivative [Line Items]            
Notional amount     $ 300.0 $ 300.0    
Accumulated Gain (Loss), Net, Cash Flow Hedge Discontinued, Including Noncontrolling Interest | Interest Rate Swap            
Derivative [Line Items]            
Unrealized gains in AOCI at time of termination $ 180.4 $ 180.4     $ 163.0