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v3.25.1

Accumulated Other Comprehensive Loss ("AOCL") - Components of AOCL (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive loss before income tax effect | $ (103.9) |  | $ (105.6)
Defined benefit plan liabilities | 2.3 |  | 2.3
Accumulated other comprehensive loss | (101.6) |  | (103.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 694.4 |  |
Other comprehensive loss before reclassifications | 0.0 | $ (3.4) |
Net amount reclassified to net income (loss) | 1.7 | 1.7 |
Ending balance | 726.3 |  |
Defined benefit plan liabilities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive loss before income tax effect | (105.2) |  | (107.0)
Defined benefit plan liabilities | 2.6 |  | 2.6
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (104.6) | (99.4) |
Other comprehensive loss before reclassifications | 0.0 | (3.4) |
Net amount reclassified to net income (loss) | 1.7 | 1.8 |
Ending balance | (102.9) | (101.0) |
Unrealized gain on financial instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive loss before income tax effect | 1.3 |  | 1.4
Defined benefit plan liabilities | (0.3) |  | $ (0.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 1.3 | 1.5 |
Other comprehensive loss before reclassifications | 0.0 | 0.0 |
Net amount reclassified to net income (loss) | 0.0 | (0.1) |
Ending balance | 1.3 | 1.4 |
Accumulated other comprehensive loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (103.3) | (97.9) |
Ending balance | $ (101.6) | $ (99.6) |

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