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Other Operating Credits and Charges, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Other Operating Credits And Charges, Net [Abstract] |  |  |  |  |  |
Other operating credits and charges, net | $ 0.0 | $ 11.4 | $ 1.0 | $ 11.6 | $ 11.4 | $ 12.6

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- Definition Non Cash Other Operating Charges And Credits + References No definition available. + Details
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- Definition Other Operating Credits And Charges [Abstract] + References No definition available. + Details
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