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Accumulated Other Comprehensive Loss - Summary (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ (206.9) $ (160.6) $ (269.3) $ (138.4)
Total other comprehensive income 228.6 29.4 335.6 160.1
Ending balance (285.1) (187.9) (285.1) (187.9)
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (2,651.7) (2,670.0) (2,757.2) (2,800.3)
Other comprehensive income (loss) before reclassifications     63.0  
Amounts reclassified from accumulated other comprehensive loss     270.3  
Total other comprehensive income     333.3  
Ending balance (2,423.9) $ (2,641.4) (2,423.9) $ (2,641.4)
Translation Adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (984.7)  
Other comprehensive income (loss) before reclassifications     115.6  
Amounts reclassified from accumulated other comprehensive loss     (2.7)  
Total other comprehensive income     112.9  
Ending balance (871.8)   (871.8)  
Postretirement Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (1,772.5)  
Other comprehensive income (loss) before reclassifications     (52.6)  
Amounts reclassified from accumulated other comprehensive loss     273.0  
Total other comprehensive income     220.4  
Ending balance $ (1,552.1)   $ (1,552.1)