Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Details)

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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity $ 612.0 $ 623.5 $ 605.7 $ 624.0
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity 3.9 0.5 2.0 0.1
Derivative gain, net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity (0.4) 0.5 0.2 2.3
Pension and postretirement adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity (58.4) (60.8) (62.1) (0.4)
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity $ (54.9) $ (59.8) $ (59.9) $ 2.0