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Quarterly Financial Summary (Unaudited) - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Actuarial gain (losses)	$ 11.4	$ (26.7)
Actuarial gain (losses), net of income tax	$ 7.3	$ (18.3)

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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.

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No definition available.

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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.

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No definition available.

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No definition available.

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