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Financial Instruments (Derivatives Effect on Statement of Operations and Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]      
Total direct operating expense on consolidated statements of operations $ 2,189.2 $ 2,312.5 $ 2,064.2
Total interest expense on consolidated statements of operations 269.8 221.2 176.0
Foreign Exchange Contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in accumulated other comprehensive income (loss) (5.8) 1.7 1.7
Gain (loss) reclassified from accumulated other comprehensive income (loss) (0.3) (0.3) (0.2)
Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in accumulated other comprehensive income (loss) 36.3 81.1 66.5
Gain (loss) reclassified from accumulated other comprehensive income (loss) 41.8 1.4 (15.0)
Loss reclassified from accumulated other comprehensive income (loss) into interest expense $ (7.2) $ (11.8) $ (33.8)