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Accumulated Other Comprehensive Loss - Changes in accumulated other comprehensive loss (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ 18.4 |  | $ 11.0
Changes in accumulated other comprehensive loss |  |  |
Other comprehensive income, net of tax, before reclassifications | 11.4 |  |
Amounts reclassified from AOCI, net of tax expense of $1.2, $—, and $1.2 | (3.9) |  |
Reclassification from AOCI, Current Period, Tax | (1.2) |  |
Less: noncontrolling interest | (7.5) | $ 14.4 |
Other comprehensive income | 7.4 |  |
Unrealized gains/(losses) on derivative financial instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 19.8 |  | 12.4
Changes in accumulated other comprehensive loss |  |  |
Other comprehensive income, net of tax, before reclassifications | 11.4 |  |
Amounts reclassified from AOCI, net of tax expense of $1.2, $—, and $1.2 | (3.9) |  |
Reclassification from AOCI, Current Period, Tax | (1.2) |  |
Other comprehensive income | 7.4 |  |
Net actuarial gains/(losses) of defined benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (1.4) |  | (1.4)
Changes in accumulated other comprehensive loss |  |  |
Other comprehensive income, net of tax, before reclassifications | 0.0 |  |
Amounts reclassified from AOCI, net of tax expense of $1.2, $—, and $1.2 | 0.0 |  |
Reclassification from AOCI, Current Period, Tax | 0.0 |  |
Other comprehensive income | 0.0 |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member] |  |  |
Changes in accumulated other comprehensive loss |  |  |
Less: noncontrolling interest | (0.1) |  |
Noncontrolling Interest [Member] |  |  |
Changes in accumulated other comprehensive loss |  |  |
Less: noncontrolling interest | (0.1) | 7.4 |
Accumulated other comprehensive income (loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 18.4 |  | $ 11.0
Changes in accumulated other comprehensive loss |  |  |
Less: noncontrolling interest | $ (7.4) | $ 7.0 |

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