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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

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