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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, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 2,746.7 | $ 2,776.2 | $ 2,684.9 | $ 2,424.4 | $ 2,326.2 | $ 2,335.4 | $ 2,684.9 | $ 2,335.4
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | (45.9) | (163.3)
Amounts reclassified out from accumulated other comprehensive (loss) income |  |  |  |  |  |  | 5.9 | 14.4
Other comprehensive (loss) income, net of tax | (39.5) | (15.1) | 14.6 | (62.6) | (63.5) | (22.8) | (40.0) | (148.9)
Ending balance | 2,868.2 | 2,746.7 | 2,776.2 | 2,470.8 | 2,424.4 | 2,326.2 | 2,868.2 | 2,470.8
(Losses) gains on derivatives |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 0.2 |  |  | (1.2) | 0.2 | (1.2)
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | (8.8) | (3.5)
Amounts reclassified out from accumulated other comprehensive (loss) income |  |  |  |  |  |  | 7.0 | 0.9
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  | (1.8) | (2.6)
Ending balance | (1.6) |  |  | (3.8) |  |  | (1.6) | (3.8)
Change in equity affiliate investment AOCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 1.6 |  |  | 1.5 | 1.6 | 1.5
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | (0.1) | (0.2)
Amounts reclassified out from accumulated other comprehensive (loss) income |  |  |  |  |  |  | 0.0 | 0.0
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  | (0.1) | (0.2)
Ending balance | 1.5 |  |  | 1.3 |  |  | 1.5 | 1.3
Defined benefit pension and other postretirement plans |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | (9.4) |  |  | (31.8) | (9.4) | (31.8)
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | (0.1) | 2.9
Amounts reclassified out from accumulated other comprehensive (loss) income |  |  |  |  |  |  | (1.1) | 13.5
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  | (1.2) | 16.4
Ending balance | (10.6) |  |  | (15.4) |  |  | (10.6) | (15.4)
Foreign currency translation |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | (175.4) |  |  | (128.1) | (175.4) | (128.1)
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | (36.9) | (162.5)
Amounts reclassified out from accumulated other comprehensive (loss) income |  |  |  |  |  |  | 0.0 | 0.0
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  | (36.9) | (162.5)
Ending balance | (212.3) |  |  | (290.6) |  |  | (212.3) | (290.6)
Accumulated other comprehensive loss |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (183.5) | (168.4) | (183.0) | (245.9) | (182.4) | (159.6) | (183.0) | (159.6)
Other comprehensive (loss) income, net of tax | (39.5) | (15.1) | 14.6 | (62.6) | (63.5) | (22.8) |  |
Ending balance | $ (223.0) | $ (183.5) | $ (168.4) | $ (308.5) | $ (245.9) | $ (182.4) | $ (223.0) | $ (308.5)

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