v3.26.1
Shareholders' Equity - Schedule of Changes in Shareholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Increase (Decrease) in Stockholders' Equity    
Beginning balance $ 1,543.9 $ 1,428.6
Net income 27.4 24.5
Other comprehensive income (loss) 2.3 13.5
Dividends (6.8) (6.6)
Incentive plan activity (4.1) 1.8
Ending balance $ 1,562.7 $ 1,461.8
Cash dividends per share, declared (in dollars per share) $ 0.32 $ 0.31
Common Stock    
Increase (Decrease) in Stockholders' Equity    
Beginning balance $ 0.2 $ 0.2
Beginning balance (in shares) 21.1 21.0
Ending balance $ 0.2 $ 0.2
Ending balance (in shares) 21.1 21.0
Additional Paid-in Capital    
Increase (Decrease) in Stockholders' Equity    
Beginning balance $ 333.3 $ 319.4
Incentive plan activity (4.1) 1.8
Ending balance 329.2 321.2
Retained Earnings    
Increase (Decrease) in Stockholders' Equity    
Beginning balance 1,189.7 1,175.6
Net income 27.4 24.5
Dividends (6.8) (6.6)
Ending balance 1,210.3 1,193.5
Accumulated Other Comprehensive Income (Loss)    
Increase (Decrease) in Stockholders' Equity    
Beginning balance 21.9 (65.4)
Other comprehensive income (loss) 2.3 13.5
Ending balance 24.2 (51.9)
Treasury Stock    
Increase (Decrease) in Stockholders' Equity    
Beginning balance (1.2) (1.2)
Ending balance $ (1.2) $ (1.2)