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Stock-Based Compensation and Other Employee Benefit Plans (Restricted Shares) (Narrative) (Details) - Restricted Shares [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation awards, unearned compensation $ 19.2 $ 19.2   $ 19.2  
Stock-based compensation awards, unearned compensation, weighted average expected recognition period (in years) 1 year 4 months 24 days        
Stock-based compensation, vested awards, intrinsic value   $ 0.2 $ 1.2 $ 11.7 $ 1.4