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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 2,576.8 | $ 2,680.6 | $ 2,881.0 | $ 2,746.7 | $ 2,776.2 | $ 2,684.9 | $ 2,881.0 | $ 2,684.9
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 5.8 | (45.9)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  |  |  | 1.7 | 5.9
Other comprehensive income (loss), net of tax | 80.6 | (24.6) | (48.5) | (39.5) | (15.1) | 14.6 | 7.5 | (40.0)
Ending balance | 2,752.1 | 2,576.8 | 2,680.6 | 2,868.2 | 2,746.7 | 2,776.2 | 2,752.1 | 2,868.2
Total |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (216.9) | (192.3) | (143.8) | (183.5) | (168.4) | (183.0) | (143.8) | (183.0)
Other comprehensive income (loss), net of tax | 80.6 | (24.6) | (48.5) | (39.5) | (15.1) | 14.6 |  |
Ending balance | (136.3) | $ (216.9) | (192.3) | (223.0) | $ (183.5) | (168.4) | (136.3) | (223.0)
Derivatives |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 0.0 |  |  | 0.2 | 0.0 | 0.2
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | (0.3) | (8.8)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  |  |  | 2.3 | 7.0
Other comprehensive income (loss), net of tax |  |  |  |  |  |  | 2.0 | (1.8)
Ending balance | 2.0 |  |  | (1.6) |  |  | 2.0 | (1.6)
Change in equity affiliate investment AOCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 2.3 |  |  | 1.6 | 2.3 | 1.6
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 0.0 | (0.1)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  |  |  | 0.0 | 0.0
Other comprehensive income (loss), net of tax |  |  |  |  |  |  | 0.0 | (0.1)
Ending balance | 2.3 |  |  | 1.5 |  |  | 2.3 | 1.5
Defined benefit pension and other postretirement plans |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | (10.1) |  |  | (9.4) | (10.1) | (9.4)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | (0.6) | (0.1)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  |  |  | (0.6) | (1.1)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  | (1.2) | (1.2)
Ending balance | (11.3) |  |  | (10.6) |  |  | (11.3) | (10.6)
Foreign currency translation |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | $ (136.0) |  |  | $ (175.4) | (136.0) | (175.4)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 6.7 | (36.9)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  |  |  | 0.0 | 0.0
Other comprehensive income (loss), net of tax |  |  |  |  |  |  | 6.7 | (36.9)
Ending balance | $ (129.3) |  |  | $ (212.3) |  |  | $ (129.3) | $ (212.3)

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