Consolidated Statements of Earnings and Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
OCI Pension and postretirement activity, net of tax	$ 2.7	$ 5.2	$ 17.1
OCI gain (loss) on cash flow hedge, tax	(2.2)	2.5	2.0
Net earnings	114.7	99.5	117.8
Cost of products sold	1,310.8	1,291.2	1,136.1
Gross profit	940.8	880.5	951.2
Selling, general and administrative expense	409.6	389.1	391.2
Advertising and sales promotion expense	229.1	238.3	241.5
Research and development expense	58.5	55.5	57.8
Restructuring charges	16.6	15.3	20.8
Operating income	227.0	182.3	239.9
Cost of early retirement of long-term debt	0.0	0.0	(26.1)
Interest expense associated with debt	78.5	71.4	67.9
Nonoperating Income (Expense)	(0.8)	13.2	1.2
Earnings before income taxes	147.7	124.1	147.1
Income tax provision	33.0	24.6	29.3
Net sales	$ 2,251.6	$ 2,171.7	$ 2,087.3
Basic net earnings per share	$ 2.24	$ 1.87	$ 2.17
Dilutive net earnings per share	$ 2.21	$ 1.85	$ 2.13
Foreign currency translation adjustments	$ 44.3	$ (89.4)	$ 5.6
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(6.6)	(4.7)	(44.8)
Deferred gain (loss) on hedging activity, net of tax	(4.8)	5.5	4.3
Other Comprehensive Income (Loss), Net of Tax	46.1	(79.2)	54.7
Total comprehensive income (loss)	$ 160.8	$ 20.3	$ 172.5