Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]
Operating revenues	$ 2,418.0	$ 3,367.0	$ 2,123.0
Cost of sales	1,097.0	1,914.0	1,241.0
Operating income (loss)	(712.0)	586.0	322.0
Net income (loss)	$ (752.0)	$ 530.0	$ 289.0