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Wynnewood Acquisition (Details) (GWEC, USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2011
subsidiary
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
GWEC
         
Acquisition          
Number of wholly-owned subsidiaries of acquired entity 2        
Preliminary purchase price $ 592.3        
Amount of increase in preliminary purchase price     1.1    
Refund resulting from post-closing working capital and capital expenditure adjustments         14.7
Transaction fees and expenses included in selling, general and administrative expense   $ 2.0   $ 10.3