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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
Sep. 30, 2019
Mar. 31, 2019
Assets:    
Available-for-sale securities $ 0.8 $ 1.2
Forward exchange contracts 1.6 1.5
Liabilities:    
Forward exchange contracts (0.7) (0.6)
Interest rate swaps (130.3) (63.6)
Level 1    
Assets:    
Available-for-sale securities 0.8 1.2
Forward exchange contracts 0.0 0.0
Liabilities:    
Forward exchange contracts 0.0 0.0
Interest rate swaps 0.0 0.0
Level 2    
Assets:    
Available-for-sale securities 0.0 0.0
Forward exchange contracts 1.6 1.5
Liabilities:    
Forward exchange contracts (0.7) (0.6)
Interest rate swaps $ (130.3) $ (63.6)