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Investments (Summary Financial Information) (Details) (ATC [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
ATC [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 160.4	$ 150.3	$ 464.3	$ 450.1
Operating income	82.9	81.5	247.1	240.0
Net income	$ 62.7	$ 60.5	$ 184.5	$ 177.9

X

- Definition

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

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