Property, Plant and Equipment, Significant Sales (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Acquisitions and Disposals [Line Items]
Proceeds from disposal of assets	$ 145.3	$ 280.6	$ 1,198.8
Gains attributable to disposal of assets	102.1	83.3	86.4
Seminole Pipeline segment [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from disposal of assets	0	86.9	0
Gains attributable to disposal of assets	0	52.5	0
Lubrication oil and specialty chemical distribution assets [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from disposal of assets	0	35.3	0
Gains attributable to disposal of assets		$ 6.7