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Share-Based Compensation (Details) (USD $)
0 Months Ended 9 Months Ended
Mar. 05, 2014
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to nonvested share-based compensation arrangements   $ 37,400,000
Compensation expense over a remaining weighted-average period   1 year 10 months 24 days
Restricted Stock Units and Stock Appreciation Rights [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of restricted stock granted 21,300,000  
Aggregate grant date fair value, net of estimated forfeitures 20,200,000  
Requisite service period 2 years 8 months 12 days  
Performance Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Target value of p-units granted during the period (in dollars per unit) $ 100  
Awards vesting period 3 years  
Total shareholder return, Minimum payout (in dollars per unit) 0  
Total shareholder return, Maximum payout (in dollars per unit) 200  
Vesting percentage based on relative total shareholder return ranking on annual basis   25.00%
Vesting percentage of performance units periodically (in hundredths)   25.00%
Grant date fair value of P-Units   $ 8,500,000
Performance measurement period   3 years
Vesting percentage of performance units (in hundredths)   25.00%