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Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2022 | May 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Derivative [Line Items] |  |  |  |  |  |
Remaining maturity of forward foreign exchange contracts, maximum |  |  | 25 months |  |  |
Reduction of asset value of derivative | $ 188.7 |  | $ 0.0 | $ (188.7) | $ 0.0 |
Unrealized gains in AOCI at time of termination |  |  | 310.5 | (786.0) | (2,683.4) | $ (2,794.6)
Derivative Liability |  |  | 2.8 | 0.1 |  |
Net Cash Provided by (Used in) Operating Activities |  |  | 396.8 | (114.3) | (660.9) |
Net Cash Provided by (Used in) Financing Activities |  |  | (39.6) | (63.8) | $ (599.4) |
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months |  |  | (1.5) |  |  |
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months |  |  | 30.4 |  |  |
Interest Rate Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Proceeds from terminated swaps | 56.4 |  |  |  |  |
Reduction of debt host | 131.3 | $ (3.2) |  |  |  |
Net Cash Provided by (Used in) Operating Activities | 188.7 |  |  |  |  |
Net Cash Provided by (Used in) Financing Activities | 134.5 |  |  |  |  |
Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Liability | 6.8 | 6.8 | $ 0.0 | $ 0.0 |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge Discontinued, Including Noncontrolling Interest | Interest Rate Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Unrealized gains in AOCI at time of termination | $ 180.4 | $ 180.4 |  |  |  |

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