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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