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Fair Value Measurements (Assets and Liabilities Required to be Carried at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2024
Mar. 31, 2024
Assets:    
Forward exchange contracts (see Note 17) $ 1.9 $ 0.0
Interest rate swaps (see Note 17) 0.7 35.6
Liabilities:    
Forward exchange contracts 0.0 (2.8)
Interest rate swaps (see Note 17) 0.0 0.0
Level 1    
Assets:    
Forward exchange contracts (see Note 17) 0.0 0.0
Interest rate swaps (see Note 17) 0.0 0.0
Liabilities:    
Forward exchange contracts 0.0 0.0
Interest rate swaps (see Note 17) 0.0 0.0
Level 2    
Assets:    
Forward exchange contracts (see Note 17) 1.9 0.0
Interest rate swaps (see Note 17) 0.7 35.6
Liabilities:    
Forward exchange contracts 0.0 (2.8)
Interest rate swaps (see Note 17) $ 0.0 $ 0.0