Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Income Statement of Equity Method Investment (Details) (USD $) In Millions, unless otherwise specified	8 Months Ended
	Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]
Operating revenues	$ 2,122.6
Cost of sales	1,240.5
Operating income	321.9
Net income	$ 288.6