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Property, Plant and Equipment - Capitalized Costs of Unproved Properties Excluded from Amortization (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Year Cost Incurred 2013	Dec. 31, 2012 Year Cost Incurred 2012	Dec. 31, 2010 Year Cost Incurred 2010 and Prior
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Pipe inventory costs, cumulative	$ 45.6			$ 0.2
Pipe inventory costs, period costs		$ 42.6	$ 2.8