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Financial Instruments (Derivatives Effect on Statement of Operations and Comprehensive Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Total direct operating expense on consolidated statements of operations $ 2,312.5 $ 2,064.2 $ 1,725.9
Total interest expense on consolidated statements of operations     181.5
Foreign Exchange Contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in accumulated other comprehensive income (loss) 1.7 1.7 (1.0)
Gain (loss) reclassified from accumulated other comprehensive income (loss) (0.3) (0.2) 0.2
Gain (loss) recognized in direct operating expense 0.0 0.0 0.3
Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in accumulated other comprehensive income (loss) 81.1 66.5 72.0
Gain (loss) reclassified from accumulated other comprehensive income (loss) 1.4 (15.0) (20.0)
Loss reclassified from accumulated other comprehensive income (loss) into interest expense $ (11.8) $ (33.8) $ (28.3)