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Stock-Based Compensation - Schedule of Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 7.5 $ 8.0 $ 5.6  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Vested, number of shares (139,795)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Ending Balance $ 1,959.8 2,013.9    
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period, shares, restricted stock award 332,085     1,352
Stock compensation expense $ 7.5 $ 8.0 5.6  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted stock, beginning of year, number of shares 363,022      
Granted, number of shares 332,085      
Vested, number of shares (135,366)      
Forfeited, number of shares (34,912)      
Canceled, number of shares 0      
Restricted stock, end of year, number of shares 524,829 363,022    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Restricted stock, beginning of year, weighted-average measurement date fair value (in dollars per share) $ 41.47      
Granted, weighted average grant date fair value (in dollars per share)   $ 28.56    
Vested, weighted average grant date fair value (in dollars per share)   40.11    
Forfeited, weighted average grant date fair value (in dollars per share)   35.50    
Canceled, weighted average grant date fair value (in dollars per share)   0    
Restricted stock, end of year, weighted-average measurement date fair value (in dollars per share) $ 33.65 $ 41.47    
Tax benefits from stock-based compensation $ 0.1 $ 0.4 0.2  
Unrecognized compensation cost related to nonvested restricted stock awards $ 9.5      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 3 months 29 days      
Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 7.5 $ 8.0 $ 5.6  
Upon Achievement of Defined Total Return to Shareholder Goals | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period, shares, restricted stock award 98,139      
Upon One-Third Annual Anniversary | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period, shares, restricted stock award 134,455      
Upon Achievement of Performance Goals | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period, shares, restricted stock award 196,278      
Upon Achievement of Defined Return on Equity Performance Goals | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period, shares, restricted stock award 98,139