Property, Plant and Equipment, Significant Sales (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Crystal Holding L.L.C. [Member]	Dec. 31, 2013 Crystal Holding L.L.C. [Member]	Dec. 31, 2012 Crystal Holding L.L.C. [Member]	Dec. 31, 2011 Crystal Holding L.L.C. [Member]	Mar. 31, 2013 Seminole Pipeline segment [Member]	Dec. 31, 2013 Seminole Pipeline segment [Member]	Dec. 31, 2012 Seminole Pipeline segment [Member]	Dec. 31, 2011 Seminole Pipeline segment [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from disposal of assets	$ 280.6	$ 1,198.8	$ 1,053.8	$ 547.8	$ 0	$ 0	$ 547.8	$ 86.9	$ 86.9	$ 0	$ 0
Gains attributable to disposal of assets	83.3	86.4	155.7	129.1	0	0	129.1	52.5	52.5	0	0
Net carrying value of property, plant and equipment	26,946.6	24,846.4	22,191.6	356.2			356.2
Total assets	$ 40,138.7	$ 35,934.4		$ 411.9			$ 411.9