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Derivative Instruments and Hedging Activities (Derivatives Effect on Statement of Operations and Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]        
Total direct operating expense on consolidated statements of operations $ 510.8 $ 584.7 $ 1,549.1 $ 1,744.7
Total interest expense on consolidated statements of operations 67.1 59.6 192.9 163.0
Forward exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in accumulated other comprehensive loss (4.3) 2.7 (7.3) 4.4
Gain (loss) reclassified from accumulated other comprehensive loss (2.6) (0.6) (2.5) (0.7)
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in accumulated other comprehensive loss (11.7) 6.5 24.7 87.8
Gain (loss) reclassified from accumulated other comprehensive loss 11.4 3.6 31.5 (5.7)
Loss reclassified from accumulated other comprehensive income (loss) into interest expense $ (1.8) $ (2.1) $ (5.5) $ (9.9)