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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
2005 Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance (in shares)   1,800,000   1,800,000    
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation   $ 1.5 $ 1.7 $ 4.5 $ 5.4  
Performance Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation   6.3 $ 4.0 11.5 $ 5.8  
Share-based award liability   18.8   $ 18.8   $ 11.1
Cash paid to settle share-based award liability $ 0.9          
Vesting period       3 years    
Fixed Value Cash Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Long-term incentive cash awards granted $ 5.0          
Vesting period       3 years    
Compensation expense   $ 0.5   $ 1.3    
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance (in shares)   500,000   500,000    
Shares authorized for issuance (in shares)   1,500,000   1,500,000    
Purchase limit per employee (in shares)       130