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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2022 | May 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022
Derivative [Line Items] |  |  |  |  |  |  |  |
Remaining maturity of forward foreign exchange contracts, maximum |  |  | 20 months |  |  |  |  |
Unrealized gains in AOCI at time of termination |  |  | $ 323.7 | $ (885.0) | $ 218.8 | $ (786.0) | $ (847.4) | $ (2,683.4)
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months |  |  | (2.0) |  |  |  |  |
Reduction of asset value of derivative | $ 188.7 |  | 0.0 | (188.7) |  |  |  |
Interest rate swap cash flow hedge gain estimated to be reclassified into earnings during next 12 months |  |  | 25.4 |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | 401.4 | (128.0) |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  | 17.4 | $ (225.7) |  |  |  |
Interest rate swaps |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Interest rate swaps | Accumulated Gain (Loss), Net, Cash Flow Hedge Discontinued, Including Noncontrolling Interest |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Unrealized gains in AOCI at time of termination | 180.4 | 180.4 |  |  |  |  |  |
Interest rate swaps | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
US Dollar Amount or Notional Amount |  |  | 1,700.0 |  |  | 1,700.0 |  |
Derivative Liability | $ 6.8 | $ 6.8 |  |  |  |  |  |
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 2.915%, Effective Date May 23, 2018 | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
US Dollar Amount or Notional Amount |  |  | $ 300.0 |  |  | $ 300.0 |  |

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