Guarantor and Non-Guarantor Financial Information (Schedule of Condensed Consolidating Statements of Earnings and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 454.0	$ 457.1
Cost of products sold	260.9	263.6
Gross profit	193.1	193.5
Selling, general and administrative expense	95.0	87.3
Advertising and sales promotion expense	41.1	51.6
Research and development expense	13.8	12.6
Restructuring charges	6.1	17.1
Gain on sale of Infant and Pet Care business	(5.2)	0.0
Interest expense associated with debt	14.3	16.0
Other (income) expense, net	(1.6)	1.3
Intercompany service fees	0.0	0.0
Equity in earnings of subsidiaries	0.0	0.0
Earnings before income taxes	29.6	7.6
Income tax provision	7.2	8.0
Net earnings (loss)	22.4	(0.4)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings (loss)	22.4	(0.4)
Other comprehensive income, net of tax	18.7	(12.1)
Total comprehensive income	41.1	(12.5)
Intercompany dividend	0.0	0.0
Eliminations
Income Statement [Abstract]
Net sales	(76.3)	(79.3)
Cost of products sold	(76.3)	(79.3)
Gross profit	0.0	0.0
Selling, general and administrative expense	0.0	0.0
Advertising and sales promotion expense	0.0	0.0
Research and development expense	0.0	0.0
Restructuring charges	0.0	0.0
Gain on sale of Infant and Pet Care business	0.0
Interest expense associated with debt	0.0	0.0
Other (income) expense, net	0.0	0.0
Intercompany service fees	0.0	0.0
Equity in earnings of subsidiaries	53.5	21.2
Earnings before income taxes	(53.5)	(21.2)
Income tax provision	0.0	0.0
Net earnings (loss)	(53.5)	(21.2)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings (loss)	(53.5)	(21.2)
Other comprehensive income, net of tax	(38.4)	23.7
Total comprehensive income	(91.9)	2.5
Intercompany dividend	163.1	45.0
Parent
Income Statement [Abstract]
Net sales	0.0	0.0
Cost of products sold	0.0	0.0
Gross profit	0.0	0.0
Selling, general and administrative expense	0.0	0.0
Advertising and sales promotion expense	0.0	0.0
Research and development expense	0.0	0.0
Restructuring charges	0.0	0.0
Gain on sale of Infant and Pet Care business	0.0
Interest expense associated with debt	13.3	13.4
Other (income) expense, net	0.0	0.0
Intercompany service fees	0.0	0.0
Equity in earnings of subsidiaries	(32.3)	(9.7)
Earnings before income taxes	19.0	(3.7)
Income tax provision	(3.4)	(3.3)
Net earnings (loss)	22.4	(0.4)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings (loss)	22.4	(0.4)
Other comprehensive income, net of tax	18.7	(12.1)
Total comprehensive income	41.1	(12.5)
Intercompany dividend	0.0	0.0
Guarantors
Income Statement [Abstract]
Net sales	296.1	299.7
Cost of products sold	189.3	192.8
Gross profit	106.8	106.9
Selling, general and administrative expense	59.1	51.2
Advertising and sales promotion expense	20.2	27.4
Research and development expense	13.8	12.6
Restructuring charges	3.1	8.9
Gain on sale of Infant and Pet Care business	(5.2)
Interest expense associated with debt	0.8	2.5
Other (income) expense, net	0.8	0.6
Intercompany service fees	(3.1)	(3.6)
Equity in earnings of subsidiaries	(21.2)	(11.5)
Earnings before income taxes	38.5	18.8
Income tax provision	6.2	9.1
Net earnings (loss)	32.3	9.7
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings (loss)	32.3	9.7
Other comprehensive income, net of tax	18.7	(12.1)
Total comprehensive income	51.0	(2.4)
Intercompany dividend	0.0	0.0
Non-Guarantors
Income Statement [Abstract]
Net sales	234.2	236.7
Cost of products sold	147.9	150.1
Gross profit	86.3	86.6
Selling, general and administrative expense	35.9	36.1
Advertising and sales promotion expense	20.9	24.2
Research and development expense	0.0	0.0
Restructuring charges	3.0	8.2
Gain on sale of Infant and Pet Care business	0.0
Interest expense associated with debt	0.2	0.1
Other (income) expense, net	(2.4)	0.7
Intercompany service fees	3.1	3.6
Equity in earnings of subsidiaries	0.0	0.0
Earnings before income taxes	25.6	13.7
Income tax provision	4.4	2.2
Net earnings (loss)	21.2	11.5
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings (loss)	21.2	11.5
Other comprehensive income, net of tax	19.7	(11.6)
Total comprehensive income	40.9	(0.1)
Intercompany dividend	$ (163.1)	$ (45.0)