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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, 2023
Mar. 31, 2023
Assets:    
Interest rate swaps $ 34.2 $ 41.1
Other Non-Current Assets    
Assets:    
Interest rate swaps 34.2 41.1
Fair Value, Measurements, Recurring    
Assets:    
Forward exchange contracts 0.0 2.9
Interest rate swaps 34.2 41.1
Liabilities:    
Forward exchange contracts (2.1) (0.1)
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Forward exchange contracts 0.0 0.0
Interest rate swaps 0.0 0.0
Liabilities:    
Forward exchange contracts 0.0 0.0
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Forward exchange contracts 0.0 2.9
Interest rate swaps 34.2 41.1
Liabilities:    
Forward exchange contracts $ (2.1) $ (0.1)