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Share-Based Compensation and Equity - Director Deferred Shares Activity (Details) - Director Deferred Shares [Member] - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-employee director deferred shares vested and outstanding 0.1    
Granted, Weighted-average grant-date fair value     $ 29.73
Aggregate intrinsic value of deferred shares released $ 0.2 $ 0.1 $ 1.0
Total fair value of deferred shares vested $ 0.0 $ 0.9 $ 1.1
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 6 months    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 12 months