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Long-term Compensation Plans - Equity Classified Share Based Payment RSUs Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Performance Restricted Stock Units (RSUs) | The 2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares of common stock that may be subject to grant awards (in shares) 83,333   83,333  
Performance Restricted Stock Units (RSUs) | The 2013 Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share multiplier (as a percent)     100.00%  
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity compensation expense (income) $ 3.0 $ 2.0 $ 8.2 $ 4.6