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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
Sep. 30, 2024
Mar. 31, 2024
Assets:    
Interest rate swaps $ 12.2 $ 35.6
Fair Value, Measurements, Recurring    
Assets:    
Interest rate swaps 12.2 35.6
Liabilities:    
Forward exchange contracts (0.6) (2.8)
Interest rate swaps (see Note 17) (1.7) 0.0
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Interest rate swaps 0.0 0.0
Liabilities:    
Forward exchange contracts 0.0 0.0
Interest rate swaps (see Note 17) 0.0 0.0
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Interest rate swaps 12.2 35.6
Liabilities:    
Forward exchange contracts (0.6) (2.8)
Interest rate swaps (see Note 17) $ (1.7) $ 0.0