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Share-Based Compensation (Details 2) (USD $)
1 Months Ended 3 Months Ended
Nov. 30, 2010
Nov. 30, 2009
Mar. 31, 2012
plan
Jun. 30, 2011
Mar. 31, 2011
Phantom Unit Appreciation Plan
         
Share-based Compensation          
Number of Phantom Unit Appreciation Plans     2    
Payments to phantom unit holders $ 3,600,000 $ 900,000   $ 9,200,000 $ 20,100,000
Compensation expense     $ 0.0   $ 11,200,000
Service Phantom interest
         
Share-based Compensation          
Interest (per point)         $ 13.14
Performance Phantom interest
         
Share-based Compensation          
Interest (per point)         $ 22.62