Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Components of AOCI (Details)

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Shareholders' Equity - Components of AOCI (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity $ 623.5 $ 624.0 $ 601.0 $ 576.8
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity 0.5 0.1 12.2  
Derivative gain (loss), net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity 0.5 2.3 1.7  
Pension and postretirement adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity (60.8) (0.4) (0.2)  
Accumulated other comprehensive (loss) income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity $ (59.8) $ 2.0 $ 13.7 $ 23.7