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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity                
Beginning balance $ 1,414.4 $ 1,435.1 $ 1,395.1 $ 1,280.5 $ 1,265.5 $ 1,270.3 $ 1,395.1 $ 1,270.3
Net income (loss) 8.3 (18.6) 37.4 26.9 34.4 16.8 27.1 78.1
Other comprehensive income (loss) (11.5) 5.1 7.1 (31.3) (14.9) (11.7) 0.7 (57.9)
Dividends (6.1) (6.1) (6.1) (5.8) (5.9) (5.9)    
Incentive plan activity 2.9 3.1 1.6 0.6 1.4 (4.1)    
Other (0.1) (4.2)   (3.1)   0.1    
Ending balance 1,407.9 1,414.4 1,435.1 1,267.8 1,280.5 1,265.5 1,407.9 1,267.8
Redeemable Non-controlling Interests                
Beginning balance 17.9 17.9 17.9 48.1 49.3 50.1 17.9 50.1
Net income (loss) (0.1) (4.2)   0.6 (0.1) 0.3    
Other comprehensive loss       (1.8) (1.1) (1.0)    
Other 0.1 4.2   2.1   (0.1)    
Ending Balance $ 17.9 $ 17.9 $ 17.9 $ 49.0 $ 48.1 $ 49.3 17.9 49.0
Cash dividends per share, declared (in dollars per share) $ 0.29 $ 0.29 $ 0.29 $ 0.28 $ 0.28 $ 0.28    
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) 20.9 20.9 20.8 20.8 20.8 20.7 20.8 20.7
Incentive plan activity (in shares)     0.1     0.1    
Ending balance $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2
Ending balance (in shares) 20.9 20.9 20.9 20.8 20.8 20.8 20.9 20.8
Additional Paid-in Capital                
Increase (Decrease) in Stockholders' Equity                
Beginning balance $ 299.7 $ 300.8 $ 299.2 $ 301.0 $ 299.6 $ 303.6 $ 299.2 $ 303.6
Incentive plan activity 2.9 3.1 1.6 0.6 1.4 (4.1)    
Other (0.1) (4.2)   (0.9)   0.1    
Ending balance 302.5 299.7 300.8 300.7 301.0 299.6 302.5 300.7
Retained Earnings                
Increase (Decrease) in Stockholders' Equity                
Beginning balance 1,136.8 1,161.5 1,130.2 992.5 964.0 953.1 1,130.2 953.1
Net income (loss) 8.3 (18.6) 37.4 26.9 34.4 16.8    
Dividends (6.1) (6.1) (6.1) (5.8) (5.9) (5.9)    
Other       (2.2)        
Ending balance 1,139.0 1,136.8 1,161.5 1,011.4 992.5 964.0 1,139.0 1,011.4
Accumulated Other Comprehensive Income (Loss)                
Increase (Decrease) in Stockholders' Equity                
Beginning balance (21.1) (26.2) (33.3) (12.0) 2.9 14.6 (33.3) 14.6
Other comprehensive income (loss) (11.5) 5.1 7.1 (31.3) (14.9) (11.7)    
Ending balance (32.6) (21.1) (26.2) (43.3) (12.0) 2.9 (32.6) (43.3)
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)