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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 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]              
Total direct operating expense on consolidated statements of operations $ 457.1 $ 433.6 $ 1,440.9 $ 1,306.0 $ 1,886.7 $ 2,207.9 $ 1,922.1
Total interest expense on consolidated statements of operations 58.5 55.5 180.1 157.1 222.5 162.6 115.0
Forward exchange contracts              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain (loss) recognized in accumulated other comprehensive income (loss) 2.4 (4.3) 3.5 (7.3)      
Gain (loss) reclassified from accumulated other comprehensive income (loss) (0.1) (2.6) (1.2) (2.5)      
Interest rate swaps              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain (loss) recognized in accumulated other comprehensive income (loss) 1.6 (11.7) (1.1) 24.7      
Gain (loss) reclassified from accumulated other comprehensive income (loss) 2.0 11.4 24.3 31.5      
Loss reclassified from accumulated other comprehensive income (loss) into interest expense $ 1.4 $ (1.8) $ (1.7) $ (5.5)      
Cash Flow Hedging              
Derivative Instruments, Gain (Loss) [Line Items]              
Total direct operating expense on consolidated statements of operations         1,886.7 2,207.9 1,922.1
Total interest expense on consolidated statements of operations         222.5 162.6 115.0
Cash Flow Hedging | Designated as Hedging Instrument | Forward 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)
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps              
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)
Cash Flow Hedging | Not Designated as Hedging Instrument | Interest rate swaps | Interest Expense              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain (loss) reclassified from accumulated other comprehensive income (loss)         $ (7.2) $ (11.8) $ (33.8)