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Share-Based Compensation (Details 7) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Incentive Unit Award
Sep. 30, 2014
Incentive Unit Award
trading_day
Sep. 30, 2014
Incentive Unit Award
Personnel Accruals
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     $ 2.9 $ 2.9  
Weighted-average period for amortization of unrecognized compensation cost       1 year 2 months 12 days  
Compensation expense     0.6 2.2  
Liability for unvested restricted share awards $ 49.5 $ 45.8     $ 2.2