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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit) $ 2.4 $ 2.1 $ 8.0 $ 11.9
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit) 0.3 0.1 1.9 3.5
Time-Based Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit) 0.7   2.8  
Performance-based Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit) $ 1.4 2.0 3.3 5.3
S&IP Business        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit)     (1.9)  
S&IP Business | Disposed of by sale        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit) allocated to discontinued operations   $ 0.5 (1.9) 1.2
S&IP Business | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit)     (0.4)  
S&IP Business | Time-Based Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit)     (0.9) $ 3.1
S&IP Business | Performance-based Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense (benefit)     $ (0.6)