v3.26.3
Accumulated Other Comprehensive Loss - Summary (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ (351.9) $ (206.9) $ (268.3) $ (269.3)
Total other comprehensive income 141.4 228.6 184.8 335.6
Ending balance (408.3) (285.1) (408.3) (285.1)
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (2,387.0) (2,651.7) (2,427.9) (2,757.2)
Other comprehensive (loss) income before reclassifications     (9.9)  
Amounts reclassified from accumulated other comprehensive loss     191.6  
Total other comprehensive income     181.7  
Ending balance (2,246.2) $ (2,423.9) (2,246.2) $ (2,423.9)
Translation Adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (871.8)  
Other comprehensive (loss) income before reclassifications     (21.8)  
Amounts reclassified from accumulated other comprehensive loss     (0.1)  
Total other comprehensive income     (21.9)  
Ending balance (893.7)   (893.7)  
Pension and Postretirement Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (1,556.1)  
Other comprehensive (loss) income before reclassifications     11.9  
Amounts reclassified from accumulated other comprehensive loss     191.7  
Total other comprehensive income     203.6  
Ending balance $ (1,352.5)   $ (1,352.5)