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Description of Business and Summary of Significant Accounting Policies - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stockholders' equity $ 982.9 $ 1,045.5 $ 1,095.9 $ 936.5
Foreign currency translation        
Stockholders' equity (96.1) (139.6) (61.1)  
Unrealized gain from hedge accounting        
Stockholders' equity 0.2 0.0 0.0  
Accumulated Other Comprehensive Loss        
Stockholders' equity $ (95.9) $ (139.6) $ (61.1) $ (16.6)