v3.26.1
Accumulated Other Comprehensive Loss - Summary (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ (284.5) $ (254.1) $ (268.3) $ (269.3)
Total other comprehensive income 25.0 64.7 43.4 107.0
Ending balance (351.9) (206.9) (351.9) (206.9)
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (2,411.7) (2,715.6) (2,427.9) (2,757.2)
Other comprehensive (loss) income before reclassifications     (5.3)  
Amounts reclassified from accumulated other comprehensive loss     46.2  
Total other comprehensive income     40.9  
Ending balance (2,387.0) $ (2,651.7) (2,387.0) $ (2,651.7)
Translation Adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (871.8)  
Other comprehensive (loss) income before reclassifications     (16.1)  
Amounts reclassified from accumulated other comprehensive loss     (0.1)  
Total other comprehensive income     (16.2)  
Ending balance (888.0)   (888.0)  
Pension and Postretirement Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (1,556.1)  
Other comprehensive (loss) income before reclassifications     10.8  
Amounts reclassified from accumulated other comprehensive loss     46.3  
Total other comprehensive income     57.1  
Ending balance $ (1,499.0)   $ (1,499.0)