CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Income tax expense, discontinued operations		$ 1.2
Pension activity, tax	$ (2.9)	8.7	$ 3.5
Deferred gain/(loss) on hedging activity, net of tax of $19.1 in 2022, $6.4 in 2021, and $(1.5) in 2020	19.1	6.4	(1.5)
Deferred gain/(loss) on hedging activity, net of tax of $19.1 in 2022, $6.4 in 2021, and $(1.5) in 2020	$ 59.1	$ 20.6	$ (5.8)