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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Not yet Recognized, RSUs and PSUs $ 18.3    
Remaining Contractual Life 2 years 9 months 25 days    
Share Price $ 23.20    
Options Outstanding, Intrinsic Value $ 0.7    
Options Exercisable, Weighted Average Remaining Contractual Term 2 years 9 months 25 days    
Options Exercisable, Intrinsic Value $ 0.7    
Restricted Stock Units and Performance Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months 18 days    
Restricted Stock Units (RSUs) | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 3 years    
Restricted Stock Units (RSUs) | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 4 years    
Performance Shares (PRSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Condition Period 1 year    
Performance Shares (PRSUs) | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout on stock-based compensation awards 0.00%    
Performance Shares (PRSUs) | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout on stock-based compensation awards 120.00%    
Omnibus Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 8,000,000    
Omnibus Stock Incentive Plan | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs and PSUs, Vested in Period, Fair Value $ 20.0 $ 11.6 $ 17.3
Omnibus Stock Incentive Plan | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 4 years    
Omnibus Stock Incentive Plan | Stock options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Expiration Period 8 years    
Omnibus Stock Incentive Plan | Stock options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Expiration Period 10 years