Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Restricted Shares) (Details)

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Stock-Based Compensation (Restricted Shares) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average GDFV of unvested shares (in dollars per share) $ 48.22    
Aggregate fair value of all restricted shares $ 17.2 $ 21.9 $ 2.3
RSAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested restricted stock (in shares) 748    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested restricted stock (in shares) 83