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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 4 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
May 08, 2013
Jun. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Share-Based Compensation [Abstract]            
Fair value of share-based compensation awards, granted $ 1.0 $ 0.3     $ 23.8 $ 18.9
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding $ 41.2       $ 41.2  
Weighted average recognition period for unrecognized compensation expense, in years         1 year 9 months 22 days  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     7 years 10 years