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Derivative Instruments and Hedging Activities (Forward Contracts Effect on Statement of Operations and Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Total direct operating expense on consolidated statements of operations $ 502.0 $ 650.1 $ 1,495.2 $ 1,726.6
Total interest expense on consolidated statements of operations [1] 42.7 31.9 116.9 105.7
Direct operating | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in direct operating expense 0.1 (0.2) 0.1 0.0
Forward exchange contracts | Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in accumulated other comprehensive income (loss) 0.8 (0.3) 1.2 (0.5)
Loss reclassified from accumulated other comprehensive income (loss) into direct operating expense (0.4) 0.0 (0.2) 0.0
Interest rate swap agreements | Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in accumulated other comprehensive income (loss) (40.5) 0.0 (35.1) 0.0
Loss reclassified from accumulated other comprehensive income (loss) into interest expense $ (2.3) $ 0.0 $ (6.1) $ 0.0
[1] Represents interest expense before interest on dissenting shareholders' liability.