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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
Mar. 31, 2023
Mar. 31, 2022
Assets:    
Interest rate swaps $ 41.1 $ 32.0
Other Non-Current Assets    
Assets:    
Interest rate swaps 41.1 32.0
Other Non-Current Assets | Interest Rate Swap, Financing    
Liabilities:    
Financing element of certain hybrid instruments 0.0 88.1
Fair Value, Measurements, Recurring    
Assets:    
Equity securities with a readily determinable fair value 0.0 0.5
Forward exchange contracts 2.9 3.5
Interest rate swaps 41.1 120.1
Liabilities:    
Forward exchange contracts (0.1) (2.8)
Interest rate swaps 0.0 28.6
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Equity securities with a readily determinable fair value 0.0 0.5
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 2.9 3.5
Interest rate swaps 41.1 120.1
Liabilities:    
Forward exchange contracts (0.1) (2.8)
Interest rate swaps $ 0.0 $ 28.6