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Condensed Consolidated Statement of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Other Capital
Treasury Stock
(Accumulated Deficit) Retained Earnings
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of change in accounting guidance | ASU 2014-09 $ 37.6       $ 37.6  
Beginning balance (in shares) at Dec. 31, 2017   73.6        
Beginning balance at Dec. 31, 2017 102.4 $ 7.4 $ 503.1 $ (64.5) (71.0) $ (272.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 48.8       48.8  
Amortization of actuarial losses and prior service credits, net of income taxes 25.0         25.0
Repurchase of shares for withholding taxes and option costs under employee equity plans (in shares)   (0.1)        
Repurchase of shares for withholding taxes and option costs under employee equity plans (2.1)   (2.1)      
Stock-based compensation and other, net (in shares)   0.4        
Stock-based compensation and shares issued under equity plans 8.4 $ 0.0 8.4      
Ending balance (in shares) at Jun. 30, 2018   73.9        
Ending balance at Jun. 30, 2018 $ 220.1 $ 7.4 $ 509.4 $ (64.5) $ 15.4 $ (247.6)