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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 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 | $ 628.2 | $ 510.5 | $ 983.8 | $ 872.5 | $ 1,886.7 | $ 2,207.9 | $ 1,922.1
Total interest expense on consolidated statements of operations | 63.0 | 51.7 | 121.6 | 101.6 | 222.5 | 162.6 | 115.0
Forward exchange contracts |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income (loss) | 0.8 | (0.6) | 1.0 | (3.1) |  |  |
Gain (loss) reclassified from accumulated other comprehensive income (loss) | (0.2) | (0.4) | (1.2) | 0.1 |  |  |
Interest rate swaps |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income (loss) | (6.3) | 9.3 | (2.8) | 36.4 |  |  |
Gain (loss) reclassified from accumulated other comprehensive income (loss) | 11.4 | 10.9 | 22.3 | 20.1 |  |  |
Loss reclassified from accumulated other comprehensive income (loss) into interest expense | $ (1.5) | $ (1.8) | $ (3.1) | $ (3.8) |  |  |
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)

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