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Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Common Stock
Treasury Stock
APIC
Retained Earnings
Beginning balance at Dec. 31, 2016 $ 697.1 $ 0.5 $ (608.0) $ 555.3 $ 749.3
Balance (in shares) at Dec. 31, 2016   46,767,164      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 120.4       120.4
Purchase of treasury stock (152.0)   (152.0)    
Issuance of treasury stock 0.1   7.0 (6.9)  
Amounts related to share-based compensation (5.2)     (5.2)  
Share-based compensation expense 4.7     4.7  
Ending balance at Sep. 30, 2017 665.1 $ 0.5 (753.0) 547.9 869.7
Balance (in shares) at Sep. 30, 2017   46,767,164      
Beginning balance at Dec. 31, 2017 738.4 $ 0.5 (806.5) 549.9 994.5
Balance (in shares) at Dec. 31, 2017   46,767,164      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 136.1       136.1
Purchase of treasury stock (144.4)   (144.4)    
Issuance of treasury stock 0.0   9.3 (9.3)  
Amounts related to share-based compensation (8.0)     (8.0)  
Share-based compensation expense 6.8     6.8  
Ending balance at Sep. 30, 2018 $ 728.9 $ 0.5 $ (941.6) $ 539.4 $ 1,130.6
Balance (in shares) at Sep. 30, 2018   46,767,164