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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 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Total direct operating expense on consolidated statements of operations $ 483.2 $ 366.8 $ 969.3 $ 789.8
Total interest expense on consolidated statements of operations 44.0 45.7 85.7 90.2
Forward exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in accumulated other comprehensive loss 0.3 (0.4) 0.2 (0.6)
Loss reclassified from accumulated other comprehensive loss (0.2) 0.0 (0.4) (0.1)
Gain recognized in direct operating expense 0.0 0.0 0.0 0.3
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in accumulated other comprehensive loss 1.9 (10.5) (38.9) (28.2)
Loss reclassified from accumulated other comprehensive loss (8.1) (9.6) (16.4) (17.0)
Loss reclassified from accumulated other comprehensive loss into interest expense $ (8.5) $ (8.0) $ (17.0) $ (11.4)