Quarterly report pursuant to Section 13 or 15(d)

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

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Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity $ 663.1 $ 617.9 $ 655.7 $ 575.4
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity (4.0) 0.1 7.3 12.2
Derivative gain, net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity 0.5 2.3 2.6 1.7
Postretirement adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity (0.3) (0.4) (0.2) (0.2)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' equity $ (3.8) $ 2.0 $ 9.7 $ 13.7