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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
Jun. 30, 2024
Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Total direct operating expense on consolidated statements of operations $ 429.2 $ 481.2
Total interest expense on consolidated statements of operations 68.8 62.0
Forward exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in accumulated other comprehensive loss 0.2 (2.5)
Gain (loss) reclassified from accumulated other comprehensive loss (1.0) 0.4
Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in accumulated other comprehensive loss 3.5 27.1
Gain (loss) reclassified from accumulated other comprehensive loss 10.9 9.1
Loss reclassified from accumulated other comprehensive income (loss) into interest expense $ (1.6) $ (1.9)