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Accumulated Other Comprehensive Loss - Summary (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning balance $ (283.4)
Other comprehensive income (loss) before reclassifications 22.1
Amounts reclassified from accumulated other comprehensive loss 19.5
Current period other comprehensive income (loss) 41.6
Ending balance (267.8)
Total  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning balance (2,757.2)
Ending balance (2,715.6)
Translation Adjustments  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning balance (984.7)
Other comprehensive income (loss) before reclassifications 43.3
Amounts reclassified from accumulated other comprehensive loss (1.1)
Current period other comprehensive income (loss) 42.2
Ending balance (942.5)
Postretirement Plans  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning balance (1,772.5)
Other comprehensive income (loss) before reclassifications (21.2)
Amounts reclassified from accumulated other comprehensive loss 20.6
Current period other comprehensive income (loss) (0.6)
Ending balance $ (1,773.1)