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Derivative Instruments and Hedging Activities (Forward Contracts Effect on Statement of Income and Comprehensive Income) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Foreign currency cash flow hedge gain (loss) reclassified to earnings $ 0.0  
Direct operating cost 530.0 $ 554.9
Interest Expense, Before Interest On Dissenters' Liability 35.4 39.0
Direct operating | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Net unrealized fair value gain (loss) on foreign exchange contracts that did not qualify as effective hedge contracts (0.7) 0.0
Forward exchange contracts | Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion 0.0 0.7
Interest rate swap agreements | Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion (6.8) 0.0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ (0.9) $ 0.0