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Fair Value Measurements (Assets and Liabilities Required to be Carried at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Mar. 31, 2021
Assets:    
Interest rate swaps $ 15.1 $ 50.8
Other Non-Current Assets    
Assets:    
Interest rate swaps 15.1 50.8
Other Non-Current Assets | Interest rate swaps, financing element    
Liabilities:    
Financing element of certain hybrid instruments 90.6 98.2
Fair Value, Measurements, Recurring    
Assets:    
Equity securities with a readily determinable fair value 1.8 1.8
Forward exchange contracts 2.0 1.5
Interest rate swaps 105.6 149.0
Liabilities:    
Forward exchange contracts (2.6) (2.6)
Interest rate swaps (46.5) (78.4)
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Equity securities with a readily determinable fair value 1.8 1.8
Forward exchange contracts 0.0 0.0
Interest rate swaps 0.0 0.0
Liabilities:    
Forward exchange contracts 0.0 0.0
Interest rate swaps 0.0 0.0
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Equity securities with a readily determinable fair value 0.0 0.0
Forward exchange contracts 2.0 1.5
Interest rate swaps 105.6 149.0
Liabilities:    
Forward exchange contracts (2.6) (2.6)
Interest rate swaps $ (46.5) $ (78.4)