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Stock Based Compensation Unrecognized Compensation Costs (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 97.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 3 months 14 days