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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
Jun. 30, 2018
Mar. 31, 2018
Assets:    
Forward exchange contracts $ 1.1 $ 0.3
Interest rate swaps 0.9 0.0
Liabilities:    
Forward exchange contracts (1.4) (0.6)
Interest rate swaps (7.8) 0.0
Fair value, net asset (liability) (0.7) 7.0
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
Interest rate swaps 0.0 0.0
Fair value, net asset (liability) 6.5 7.3
Level 2    
Assets:    
Forward exchange contracts 1.1 0.3
Interest rate swaps 0.9 0.0
Liabilities:    
Forward exchange contracts (1.4) (0.6)
Interest rate swaps (7.8) 0.0
Fair value, net asset (liability) (7.2) (0.3)
Next Games    
Assets:    
Available-for-sale securities 6.5 7.3
Next Games | Level 1    
Assets:    
Available-for-sale securities 6.5 7.3
Next Games | Level 2    
Assets:    
Available-for-sale securities $ 0.0 $ 0.0