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Stock-Based Compensation - Schedule of Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option awards granted 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 0    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price $ 0.00    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding options, beginning of year, number of shares 642,255    
Exercised, number of shares (199,667)    
Forfeited, number of shares (14,412)    
Outstanding options, end of year, number of shares 428,176 642,255  
Outstanding options exercisable, end of year, number of shares 428,176    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Outstanding options, beginning of year, weighted average exercise price (in dollars per share) $ 16.13    
Exercised, weighted average exercise price (in dollars per share) 17.12    
Forfeited, weighted average exercise price (in dollars per share) 20.87    
Outstanding options, end of year, weighted average exercise price (in dollars per share) 15.61 $ 16.13  
Outstanding options exercisable, end of year, weighted average exercise price (in dollars per share) $ 15.61    
Outstanding options, end of year weighted average remaining contractual term (in years) 1 year 6 months 21 days    
Outstanding options exercisable, end of year, weighted average remaining contractual term (in years) 1 year 6 months 21 days    
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of options exercised $ 4.9 $ 6.3 $ 5.6
Proceeds from Stock Options Exercised 1.8 2.4 4.7
Common Stock Redeemed For Payment of Stock Option Exercises, Aggregate Value $ 1.6 $ 2.8 $ 3.1