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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | $ (538.2) | $ (336.0) |
Other comprehensive income, net of tax | (202.2) | 130.8 | $ (291.3)
Foreign currency translation adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | (540.4) | (334.1) | (466.5)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (207.0) | 132.9 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.0 | 0.0 |
Other Comprehensive Income (Loss), Tax | 0.7 | (0.5) |
Other comprehensive income, net of tax | (206.3) | 132.4 |
Other Postretirement Benefit Plan [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | (1.8) | (2.8) | 10.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (0.7) | (13.1) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1.6 | 0.7 |
Other Comprehensive Income (Loss), Tax | 0.1 | (0.4) |
Other comprehensive income, net of tax | 1.0 | (12.8) |
Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | 4.0 | 0.9 | (10.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 6.3 | 13.4 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (2.2) | 1.2 |
Other Comprehensive Income (Loss), Tax | (1.0) | (3.4) |
Other comprehensive income, net of tax | 3.1 | 11.2 |
Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | (538.2) | (336.0) | $ (466.8)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (201.4) | 133.2 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (0.6) | 1.9 |
Other Comprehensive Income (Loss), Tax | (0.2) | (4.3) |
Other comprehensive income, net of tax | $ (202.2) | $ 130.8 |

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