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Share-Based Compensation Schedule Of Stock Option Transactions (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at beginning of period 1,802,387  
Options canceled (311,203)  
Outstanding at end of period 1,491,184  
Options exercisable, shares 1,491,184  
Unvested options, shares 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted average exercise price, beginning of year $ 20.87  
Weighted average exercise price, canceled in period 30.08  
Weighted average exercise price, end of year 18.94  
Options exercisable, weighted average exercise price 18.94  
Unvested options, weighted average exercise price $ 0  
Weighted average remaining contractual term, options outstanding 2 years 7 days  
Weighted average remaining contractual term, options exercisable 2 years 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  
Income tax effect of compensation plan $ 1.1 $ 1.0