Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 483.9	$ 609.2	$ 1,460.9	$ 1,613.0
Cost of products sold	261.2	317.0	802.1	876.4
Gross profit	222.7	292.2	658.8	736.6
Selling, general and administrative expense	91.3	94.8	307.8	280.2
Advertising and sales promotion expense	67.5	91.8	155.6	191.3
Research and development expense	12.4	12.9	40.1	39.5
Impairment charges	0.0	570.0	0.0	570.0
Restructuring charges	8.0	7.1	20.6	37.7
Gain on sale of Infant and Pet Care business	0.0	0.0	(4.1)	0.0
Interest expense associated with debt	15.5	15.6	43.7	48.0
Cost of early retirement of long-term debt	26.2	0.0	26.2	0.0
Other (income) expense, net	(3.5)	2.7	5.8	1.3
Earnings (loss) before income taxes	5.3	(502.7)	63.1	(431.4)
Income tax provision (benefit)	0.6	(42.0)	16.5	(18.5)
Net earnings (loss)	$ 4.7	$ (460.7)	$ 46.6	$ (412.9)
Basic net earnings (loss) per share	$ 0.09	$ (8.51)	$ 0.86	$ (7.63)
Diluted net earnings (loss) per share	$ 0.09	$ (8.51)	$ 0.86	$ (7.63)
Condensed Consolidated Statements of Comprehensive Income
Net earnings (loss)	$ 4.7	$ (460.7)	$ 46.6	$ (412.9)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	14.5	12.6	8.1	(9.4)
Pension and postretirement activity, net of tax	(1.1)	(0.5)	(1.8)	(0.2)
Deferred (loss) gain on hedging activity, net of tax	(1.8)	(2.0)	(1.5)	(3.0)
Total other comprehensive income (loss), net of tax	11.6	10.1	4.8	(12.6)
Total comprehensive income (loss)	$ 16.3	$ (450.6)	$ 51.4	$ (425.5)