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Accumulated Other Comprehensive Loss - Changes in accumulated other comprehensive loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ 17.7 |  |  |  |  |  | $ 17.7 |  | $ 19.7
Changes in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |
Other comprehensive income, net of tax, before reclassifications |  |  |  |  |  |  | 14.4 |  |
Amounts reclassified from AOCI, net of tax benefit of $8.5, $—, and $8.5 |  |  |  |  |  |  | (23.6) |  |
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  | 8.5 |  |
Less: noncontrolling interest | (0.2) | $ (5.0) | $ 14.4 | $ (10.3) | $ (5.3) | $ (17.3) | 9.2 | $ (32.9) |
Other comprehensive loss |  |  |  |  |  |  | (2.0) |  |
Unrealized gains/(losses) on derivative financial instruments |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 18.9 |  |  |  |  |  | 18.9 |  | 20.9
Changes in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |
Other comprehensive income, net of tax, before reclassifications |  |  |  |  |  |  | 14.4 |  |
Amounts reclassified from AOCI, net of tax benefit of $8.5, $—, and $8.5 |  |  |  |  |  |  | (23.6) |  |
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  | 8.5 |  |
Other comprehensive loss |  |  |  |  |  |  | (2.0) |  |
Unrealized gains/(losses) on derivative financial instruments | TRIP Holdings [Member] |  |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  | 13.2 |  |
Unrealized gains/(losses) on derivative financial instruments | Parent |  |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  | 4.4 |  |
Net actuarial gains/(losses) of defined benefit plans |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (1.2) |  |  |  |  |  | (1.2) |  | (1.2)
Changes in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |
Other comprehensive income, net of tax, before reclassifications |  |  |  |  |  |  | 0.0 |  |
Amounts reclassified from AOCI, net of tax benefit of $8.5, $—, and $8.5 |  |  |  |  |  |  | 0.0 |  |
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  | 0.0 |  |
Other comprehensive loss |  |  |  |  |  |  | 0.0 |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |
Less: noncontrolling interest |  |  |  |  |  |  | 7.2 |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |
Less: noncontrolling interest | (0.1) | (0.1) | 7.4 | (0.3) | 1.0 | (0.2) | 7.2 |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 17.7 |  |  |  |  |  | $ 17.7 |  | $ 19.7
Changes in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |
Less: noncontrolling interest | $ (0.1) | $ (4.9) | $ 7.0 | $ (10.0) | $ (6.3) | $ (17.1) |  |  |

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