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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-Based Compensation [Abstract]        
Fair value of share-based compensation awards, granted $ 0.4 $ 0.6 $ 26.1 $ 24.4
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding $ 44.2   $ 44.2  
Weighted average recognition period for unrecognized compensation expense, in years     1 year 9 months 18 days