Restructuring Charges (Schedule of Charges Related to Restructuring Activities) (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses and Cost of Product Sold	[1]	$ 8.0	$ 18.5
Project Fuel
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs		1.3	9.2
Asset impairment and accelerated depreciation		0.0	0.5
Consulting, project implementation and management, and other exit costs		6.7	8.8
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses and Cost of Product Sold		8.0	18.5
Project Fuel | Wet Shave
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs		0.0	7.3
Asset impairment and accelerated depreciation		0.0	0.0
Consulting, project implementation and management, and other exit costs		2.8	2.3
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses and Cost of Product Sold		2.8	9.6
Project Fuel | Sun and Skin Care
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs		0.0	0.5
Asset impairment and accelerated depreciation		0.0	0.0
Consulting, project implementation and management, and other exit costs		0.0	0.0
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses and Cost of Product Sold		0.0	0.5
Project Fuel | Feminine Care
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs		0.0	0.3
Asset impairment and accelerated depreciation		0.0	0.0
Consulting, project implementation and management, and other exit costs		0.0	0.0
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses and Cost of Product Sold		0.0	0.3
Project Fuel | All Other
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs		0.0	0.1
Asset impairment and accelerated depreciation		0.0	0.0
Consulting, project implementation and management, and other exit costs		0.0	0.0
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses and Cost of Product Sold		0.0	0.1
Project Fuel | Corporate
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs		1.3	1.0
Asset impairment and accelerated depreciation		0.0	0.5
Consulting, project implementation and management, and other exit costs		3.9	6.5
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses and Cost of Product Sold		5.2	8.0
IT enablement | Selling, general and administrative expenses | Project Fuel
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses and Cost of Product Sold		$ 1.9	$ 1.4

[1] Includes pre-tax SG&A of $1.9 and $1.4 for the three months ended December 31, 2019 and 2018, respectively, associated with certain information technology enablement expenses for Project Fuel.