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Shareholders' Equity - Changes in Shareholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Increase (Decrease) in Stockholders' Equity                
Beginning balance $ 1,496.1 $ 1,461.8 $ 1,428.6 $ 1,430.4 $ 1,413.9 $ 1,409.7 $ 1,428.6 $ 1,409.7
Net income 21.6 26.4 24.5 19.8 26.7 12.5 72.5 59.0
Other comprehensive income (loss) 4.7 10.4 13.5 9.3 (8.1) (3.5) 28.6 (2.3)
Dividends (6.6) (6.5) (6.6) (6.4) (6.3) (6.3)    
Incentive plan activity 5.3 4.0 1.8 4.8 4.2 1.5    
Ending balance $ 1,521.1 $ 1,496.1 $ 1,461.8 1,457.9 1,430.4 1,413.9 1,521.1 1,457.9
Redeemable Non-controlling Interests                
Beginning balance       0.0 0.0 17.9   17.9
Acquisition of Alluxa non-controlling interests           (17.9)    
Net income       0.0        
Other comprehensive income (loss)       0.0 0.0      
Ending Balance       $ 0.0 $ 0.0 $ 0.0   0.0
Cash dividends per share, declared (in dollars per share) $ 0.31 $ 0.31 $ 0.31 $ 0.30 $ 0.30 $ 0.30    
Common Stock                
Increase (Decrease) in Stockholders' Equity                
Beginning balance $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2
Beginning balance (in shares) 21.0 21.0 21.0 21.0 21.0 21.0 21.0 21.0
Ending balance $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2
Ending balance (in shares) 21.0 21.0 21.0 21.0 21.0 21.0 21.0 21.0
Additional Paid-in Capital                
Increase (Decrease) in Stockholders' Equity                
Beginning balance $ 325.2 $ 321.2 $ 319.4 $ 310.6 $ 306.4 $ 304.9 $ 319.4 $ 304.9
Incentive plan activity 5.3 4.0 1.8 4.8 4.2 1.5    
Ending balance 330.5 325.2 321.2 315.4 310.6 306.4 330.5 315.4
Retained Earnings                
Increase (Decrease) in Stockholders' Equity                
Beginning balance 1,213.4 1,193.5 1,175.6 1,154.6 1,134.2 1,128.0 1,175.6 1,128.0
Net income 21.6 26.4 24.5 19.8 26.7 12.5    
Dividends (6.6) (6.5) (6.6) (6.4) (6.3) (6.3)    
Ending balance 1,228.4 1,213.4 1,193.5 1,168.0 1,154.6 1,134.2 1,228.4 1,168.0
Accumulated Other Comprehensive Income (loss)                
Increase (Decrease) in Stockholders' Equity                
Beginning balance (41.5) (51.9) (65.4) (33.8) (25.7) (22.2) (65.4) (22.2)
Other comprehensive income (loss) 4.7 10.4 13.5 9.3 (8.1) (3.5)    
Ending balance (36.8) (41.5) (51.9) (24.5) (33.8) (25.7) (36.8) (24.5)
Treasury Stock                
Increase (Decrease) in Stockholders' Equity                
Beginning balance (1.2) (1.2) (1.2) (1.2) (1.2) (1.2) (1.2) (1.2)
Ending balance $ (1.2) $ (1.2) $ (1.2) $ (1.2) $ (1.2) $ (1.2) $ (1.2) $ (1.2)