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Derivative Instruments and Hedging Activities (Derivatives Effect on Statement of Operations and Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Total direct operating expense on consolidated statements of operations $ 594.6 $ 502.0 $ 1,662.0 $ 1,495.2
Total interest expense on consolidated statements of operations [1] 48.7 42.7 145.7 116.9
Forward exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in accumulated other comprehensive loss (0.3) 0.8 (0.2) 1.2
Gain (loss) reclassified from accumulated other comprehensive loss into direct operating expense 0.4 (0.4) 1.9 (0.2)
Gain recognized in direct operating expense 0.1 0.1 0.2 0.1
Interest rate swap agreements        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in accumulated other comprehensive loss 23.3 (40.5) (43.4) (35.1)
Gain (loss) reclassified from accumulated other comprehensive loss into direct operating expense $ (4.5) $ (2.3) $ (8.9) $ (6.1)
[1] Represents interest expense before interest on dissenting shareholders' liability.