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Share-Based Compensation Schedule of Stock Option Transactions (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Stock options outstanding, beginning of year 1,802,387    
Options exercised 0    
Options Cancelled (311,203)    
Stock options outstanding, end of year 1,491,184 1,802,387  
Options exercisable, shares 1,491,184    
Unvested options, shares 0    
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Weighted average exercise price, beginning of year $ 20.87    
Weighted average exercise price, granted in period 0    
Weighted average exercise price, cancelled in period 30.08    
Weighted average exercise price, end of year 18.94 $ 20.87  
Options exercisable, weighted average exercise price 18.94    
Unvested options, weighted average exercise price $ 0    
Weighted average remaining contractual term, options outstanding 1 year 9 months 7 days    
Weighted average remaining contractual term, options exercisable 1 year 9 months 7 days    
Weighted average remaining contractual term, options unvested 0 years    
Aggregate intrinsic value, options outstanding $ 0.0    
Aggregate intrinsic value, options exercisable 0.0    
Aggregate intrinsic value, options unvested 0.0    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Intrinsic value of options exercised     $ 0.1
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 1.1 $ 2.3