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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
May 08, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-Based Compensation [Abstract]          
Fair value of share-based compensation awards, granted $ 2.5 $ 2.0   $ 22.8 $ 18.6
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding $ 46.6     $ 46.6  
Weighted average recognition period for unrecognized compensation expense, in years       2 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     7 years 10 years