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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, 2018
Mar. 31, 2018
Assets:    
Available-for-sale securities $ 4.6 $ 7.3
Forward exchange contracts 0.8 0.3
Interest rate swaps 5.4 0.0
Liabilities:    
Forward exchange contracts (0.5) (0.6)
Fair value, net asset (liability) 10.3 7.0
Level 1    
Assets:    
Available-for-sale securities 4.6 7.3
Forward exchange contracts 0.0 0.0
Interest rate swaps 0.0 0.0
Liabilities:    
Forward exchange contracts 0.0 0.0
Fair value, net asset (liability) 4.6 7.3
Level 2    
Assets:    
Available-for-sale securities 0.0 0.0
Forward exchange contracts 0.8 0.3
Interest rate swaps 5.4 0.0
Liabilities:    
Forward exchange contracts (0.5) (0.6)
Fair value, net asset (liability) $ 5.7 $ (0.3)