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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 2,683.1 | $ 2,682.3 | $ 2,680.6 | $ 2,881.0 | $ 2,682.3 | $ 2,881.0
Other comprehensive income (loss) before reclassifications |  |  |  |  | 169.3 | (74.5)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  | 0.1 | 1.4
Other comprehensive income (loss), net of tax | 116.8 | 52.6 | (24.6) | (48.5) | 169.4 | (73.1)
Ending balance | 2,929.1 | 2,683.1 | 2,576.8 | 2,680.6 | 2,929.1 | 2,576.8
Total |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (205.5) | (258.1) | (192.3) | (143.8) | (258.1) | (143.8)
Other comprehensive income (loss), net of tax | 116.8 | 52.6 | (24.6) | (48.5) |  |
Ending balance | (88.7) | (205.5) | (216.9) | (192.3) | (88.7) | (216.9)
Derivatives |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | (2.5) |  | 0.0 | (2.5) | 0.0
Other comprehensive income (loss) before reclassifications |  |  |  |  | 4.7 | (6.3)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  | 0.3 | 1.8
Other comprehensive income (loss), net of tax |  |  |  |  | 5.0 | (4.5)
Ending balance | 2.5 |  | (4.5) |  | 2.5 | (4.5)
Change in equity affiliate investment AOCI |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 2.5 |  | 2.3 | 2.5 | 2.3
Other comprehensive income (loss) before reclassifications |  |  |  |  | 0.2 | (0.2)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  | 0.0 | 0.0
Other comprehensive income (loss), net of tax |  |  |  |  | 0.2 | (0.2)
Ending balance | 2.7 |  | 2.1 |  | 2.7 | 2.1
Defined benefit pension and other postretirement plans |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | (9.8) |  | (10.1) | (9.8) | (10.1)
Other comprehensive income (loss) before reclassifications |  |  |  |  | (0.9) | 0.0
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  | (0.2) | (0.4)
Other comprehensive income (loss), net of tax |  |  |  |  | (1.1) | (0.4)
Ending balance | (10.9) |  | (10.5) |  | (10.9) | (10.5)
Foreign currency translation |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | $ (248.3) |  | $ (136.0) | (248.3) | (136.0)
Other comprehensive income (loss) before reclassifications |  |  |  |  | 165.3 | (68.0)
Amounts reclassified out from accumulated other comprehensive income (loss) |  |  |  |  | 0.0 | 0.0
Other comprehensive income (loss), net of tax |  |  |  |  | 165.3 | (68.0)
Ending balance | $ (83.0) |  | $ (204.0) |  | $ (83.0) | $ (204.0)

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