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Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	5 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Summarized Income Statement of Equity Method Investment [Abstract]
Operating revenues	$ 796.4	$ 1,298.4
Gross margin	337.1	544.5
Operating income	132.0	206.7
Net income	$ 123.3	$ 188.4

The amount of gross profit (loss) reported by an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.