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Share-Based Compensation (Details 7) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Incentive Unit Award
trading_day
Mar. 31, 2014
Personnel Accruals
Incentive Unit Award
Share-Based Compensation        
Vesting period     3 years  
Vesting rights percentage     33.33%  
Number of share right to receive cash payment on vesting equal to fair market value is received per award     1  
Period for determination of cash payment value     10  
Unrecognized compensation cost     $ 4.7  
Weighted-average period for amortization of unrecognized compensation cost     1 year 8 months 12 days  
Compensation expense     0.8  
Liability for unvested restricted share awards $ 35.0 $ 45.8   $ 0.8