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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Derivative [Line Items]            
Remaining maturity of forward foreign exchange contracts, maximum     25 months      
Reduction of asset value of derivative $ 188.7   $ 0.0 $ (188.7) $ 0.0  
Unrealized gains in AOCI at time of termination     310.5 (786.0) (2,683.4) $ (2,794.6)
Derivative Liability     2.8 0.1    
Net Cash Provided by (Used in) Operating Activities     396.8 (114.3) (660.9)  
Net Cash Provided by (Used in) Financing Activities     (39.6) (63.8) $ (599.4)  
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months     (1.5)      
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months     30.4      
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          
Designated as Hedging Instrument | Interest Rate Swap            
Derivative [Line Items]            
Derivative Liability 6.8 6.8 $ 0.0 $ 0.0    
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