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Property, Plant and Equipment, Significant Sales (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Significant Acquisitions and Disposals [Line Items]    
Proceeds from disposal of assets $ 121.5 $ 256.3
Gains attributable to disposal of assets 99.0 68.4
Seminole Pipeline segment [Member]
   
Significant Acquisitions and Disposals [Line Items]    
Proceeds from disposal of assets 0 86.9
Gains attributable to disposal of assets 0 52.5
Lubrication oil and specialty chemical distribution assets [Member]
   
Significant Acquisitions and Disposals [Line Items]    
Proceeds from disposal of assets 0 35.3
Gains attributable to disposal of assets   $ 6.7