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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
$0.001 Par Value Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Other Comprehensive Loss
Retained Earnings
Balance (in shares) at Dec. 31, 2019   53,000,000.0   1,200,000    
Beginning balance at Dec. 31, 2019 $ 1,088.5 $ 0.1 $ 716.1 $ (39.6) $ (9.9) $ 421.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation activity (in shares)   1,100,000        
Share-based compensation activity 42.4   42.4      
Net income 80.2         80.2
Other comprehensive income (loss) (12.3)       (12.3)  
Balance (in shares) at Jun. 30, 2020   54,100,000   1,200,000    
Ending balance at Jun. 30, 2020 1,198.8 $ 0.1 758.5 $ (39.6) (22.2) 502.0
Balance (in shares) at Mar. 31, 2020   53,500,000   1,200,000    
Beginning balance at Mar. 31, 2020 1,074.8 $ 0.1 726.2 $ (39.6) (21.2) 409.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation activity (in shares)   600,000        
Share-based compensation activity 32.3   32.3      
Net income 92.7         92.7
Other comprehensive income (loss) (1.0)       (1.0)  
Balance (in shares) at Jun. 30, 2020   54,100,000   1,200,000    
Ending balance at Jun. 30, 2020 $ 1,198.8 $ 0.1 758.5 $ (39.6) (22.2) 502.0
Balance (in shares) at Dec. 31, 2020 54,300,000 54,300,000   1,200,000    
Beginning balance at Dec. 31, 2020 $ 1,447.0 $ 0.1 784.9 $ (39.6) (25.3) 726.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation activity (in shares)   600,000        
Share-based compensation activity 19.5   19.5      
Net income 74.3         74.3
Other comprehensive income (loss) $ 2.9       2.9  
Balance (in shares) at Jun. 30, 2021 54,900,000 54,900,000   1,200,000    
Ending balance at Jun. 30, 2021 $ 1,543.7 $ 0.1 804.4 $ (39.6) (22.4) 801.2
Balance (in shares) at Mar. 31, 2021   54,800,000   1,200,000    
Beginning balance at Mar. 31, 2021 1,522.8 $ 0.1 790.1 $ (39.6) (24.4) 796.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation activity (in shares)   100,000        
Share-based compensation activity 14.3   14.3      
Net income 4.6         4.6
Other comprehensive income (loss) $ 2.0       2.0  
Balance (in shares) at Jun. 30, 2021 54,900,000 54,900,000   1,200,000    
Ending balance at Jun. 30, 2021 $ 1,543.7 $ 0.1 $ 804.4 $ (39.6) $ (22.4) $ 801.2