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Quarterly Financial Summary (Unaudited) Quarterly Financial Summary (Unaudited) - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |
Actuarial gain (loss) | $ (26.7) | $ 30.1
Actuarial gain (loss), net of income tax | $ (18.3) | $ 21.4

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- Definition Mark-to-market adjustments for the gain or losses occurring on pension or postretirement plans during the year, and any mark-to-market true-up or other adjustments, net of income taxes. + References No definition available. + Details
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