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Condensed Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Retained Earnings
Cumulative Effect Period Of Adoption Adjustment
Treasury Stock
Balance at beginning of period at Dec. 31, 2019   $ 0.4 $ 592.2 $ (121.0) $ 236.2 $ (0.2) $ (61.9)
Increase (Decrease) in Stockholders' Equity              
Stock options exercised and issuance of other stock awards     (2.7)       2.3
Stock-based compensation     5.4        
Other comprehensive income (loss)       11.9      
Net income (loss) $ (20.9)       (20.9)    
Common stock repurchases             (12.0)
Balance at end of period at Sep. 30, 2020 629.7 0.4 594.9 (109.1) 215.1   (71.6)
Balance at beginning of period at Jun. 30, 2020   0.4 596.0 (124.1) 215.5 (72.1)
Increase (Decrease) in Stockholders' Equity              
Stock options exercised and issuance of other stock awards     (0.6)       0.5
Stock-based compensation     (0.5)        
Other comprehensive income (loss)       15.0      
Net income (loss) (0.4)       (0.4)    
Balance at end of period at Sep. 30, 2020 629.7 0.4 594.9 (109.1) 215.1   (71.6)
Balance at beginning of period at Dec. 31, 2020   0.4 595.1 (97.5) 216.9 (71.4)
Increase (Decrease) in Stockholders' Equity              
Stock options exercised and issuance of other stock awards     0.3       5.3
Stock-based compensation     6.4        
Other comprehensive income (loss)       (21.1)      
Net income (loss) 14.6       14.6    
Common stock repurchases   (10.6)          
Balance at end of period at Sep. 30, 2021 649.0 0.4 601.8 (118.6) 231.5   (66.1)
Balance at beginning of period at Jun. 30, 2021   0.4 600.1 (109.5) 231.7 (66.5)
Increase (Decrease) in Stockholders' Equity              
Stock options exercised and issuance of other stock awards     0.1       0.4
Stock-based compensation     1.6        
Other comprehensive income (loss)       (9.1)      
Net income (loss) 0.2       0.2    
Balance at end of period at Sep. 30, 2021 $ 649.0 $ 0.4 $ 601.8 $ (118.6) $ 231.5   $ (66.1)