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Equity Incentive Program - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award        
Document Fiscal Year Focus     2019  
Allocated share-based compensation expense $ 5.2 $ 6.5 $ 19.2 $ 20.8
Document Period End Date     Sep. 30, 2019  
SSARs        
Share-based Compensation Arrangement by Share-based Payment Award        
Unrecognized compensation expense 0.0   $ 0.0  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Unrecognized compensation expense 6.8   $ 6.8  
Weighted average period for compensation expense to be recognized     1 year 4 months 24 days  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award        
Unrecognized compensation expense 27.2   $ 27.2  
Weighted average period for compensation expense to be recognized     1 year 4 months 24 days  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award        
Unrecognized compensation expense $ 8.0   $ 8.0  
Weighted average period for compensation expense to be recognized     2 years  
Minimum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award        
Percentage increase of initial grant value     0.00%  
Maximum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award        
Percentage increase of initial grant value     225.00%