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Share-Based Compensation Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Issuance of common stock from exercise of options, net $ 0.2  
Share-based Payment Arrangement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted Average Exercise Price, Options   $ 37.35
Options, Exercisable, Weighted Average Remaining Contractual Term   1 year 7 months 6 days
Options, Exercisable, Intrinsic Value   $ 0.1
2004 Non-employee Plan [Member] | Share-based Payment Arrangement [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding options   1,500