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Share-Based and Long-Term Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Stock Options
Dec. 31, 2013
Stock Options
Jun. 30, 2014
Restricted Stock Units (RSUs)
Dec. 31, 2013
Restricted Stock Units (RSUs)
Jun. 30, 2014
Profits Interest Units
Dec. 31, 2013
Profits Interest Units
Jun. 30, 2014
Restricted Stock
Dec. 31, 2013
Restricted Stock
Jun. 30, 2014
Deferred Incentive Share Units
Dec. 31, 2013
Deferred Incentive Share Units
Jun. 30, 2014
2013 Equity Plan
Profits Interest Units
Jun. 30, 2014
2010 Equity Plan
Restricted Stock
Jun. 30, 2014
2010 Equity Plan
Deferred Incentive Share Units
Jun. 30, 2014
25% per Year in the First Four Years
2013 Equity Plan
Stock Options
Jun. 30, 2014
25% per Year in the First Four Years
2013 Equity Plan
Restricted Stock Units (RSUs)
Jun. 30, 2014
Performance
2013 Equity Plan
Restricted Stock Units (RSUs)
Jun. 30, 2014
Minimum
2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Vesting period (in years)                           4 years 4 years       3 years
Number of shares granted for stock options     0                         1,850,000      
Award vesting rights (in percents)                               25.00%      
Number of options vested (in shares)                               462,500      
Number of options remain unvested (in shares)                               1,387,500      
Value of shares outstanding for stock options                               $ 5.8      
Weighted average price per share outstanding (dollars per share)     $ 4.18 $ 4.18                       $ 4.18      
Number of units granted (in shares)         234,021   116,134   0   0   330,577 16,928 14,000   510,194 142,448  
Value of units outstanding                         3.1 0.3 0.2   8.0 2.2  
Weighted average price per unit outstanding (dollars per share)         $ 18.55 $ 17.65 $ 9.38 $ 9.79 $ 14.86 $ 15.04 $ 15.68 $ 15.67 $ 9.38 $ 14.86 $ 15.68   $ 15.73 $ 15.68  
Share-based compensation expense 4.7 1.2                                  
Non-vested awards compensation expense not yet recognized $ 12.4                                    
Non-vested awards compensation expense recognition period 2 years