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COMBINED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME (Condensed) Parenthetical - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Pension/postretirement activity, tax	$ 0.3	$ 0.3	$ 0.6	$ 0.8
Deferred (loss)/gain on hedging activity, tax	(0.8)	$ 1.5	$ (1.8)	$ 2.6
Income tax benefit attributable to discontinued operations	$ 2.9

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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