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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, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Total direct operating expense on consolidated statements of operations $ 459.3 $ 594.6 $ 1,249.0 $ 1,662.0
Total interest expense on consolidated statements of operations 45.0 48.7 135.2 145.7
Forward exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain recognized in accumulated other comprehensive loss 2.0 0.1 1.5 1.7
Gain (loss) reclassified from accumulated other comprehensive loss 0.3 0.4 0.3 1.9
Gain recognized in direct operating expense 0.0 0.1 0.3 0.2
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain recognized in accumulated other comprehensive loss 12.2 18.8 (16.0) (52.3)
Gain (loss) reclassified from accumulated other comprehensive loss (8.2) (4.5) (25.2) (8.9)
Loss reclassified from accumulated other comprehensive loss into interest expense $ (8.5) $ 0.0 $ (20.0) $ 0.0