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Accumulated Other Comprehensive Loss ("AOCL") - Components of AOCL (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive loss before income tax effect | $ (101.9) |  | $ (100.2)
Defined benefit plan liabilities | 2.3 |  | 2.3
Accumulated other comprehensive loss | (99.6) |  | (97.9)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 355.6 |  |
Other comprehensive loss before reclassifications | (3.4) |  |
Net amount reclassified to net income (loss) | 1.7 | $ 1.1 |
Ending balance | 601.5 |  |
Defined benefit plan liabilities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive loss before income tax effect | (103.5) |  | (101.8)
Defined benefit plan liabilities | 2.6 |  | 2.6
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (99.4) | (95.6) |
Other comprehensive loss before reclassifications | (3.4) |  |
Net amount reclassified to net income (loss) | 1.8 | 1.2 |
Ending balance | (101.0) | (94.4) |
Unrealized gain on financial instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive loss before income tax effect | 1.6 |  | 1.6
Defined benefit plan liabilities | (0.3) |  | $ (0.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 1.5 | 1.6 |
Other comprehensive loss before reclassifications | 0.0 |  |
Net amount reclassified to net income (loss) | (0.1) | (0.1) |
Ending balance | 1.4 | 1.5 |
Accumulated other comprehensive loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (97.9) | (94.0) |
Ending balance | $ (99.6) | $ (92.9) |

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