Background and Basis of Presentation (Details) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($) country $ / shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2020 USD ($) country $ / shares	Jun. 30, 2019 USD ($) $ / shares	Oct. 01, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of countries in which Edgewell operates | country	20		20
Number of countries with retail operations | country	50		50
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 44.9		$ 44.9
Operating lease, liability	45.1		45.1
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Impairment charges	0.0	$ 570.0	0.0	$ 570.0
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 | $ / shares	$ 0.09	$ (8.51)	$ 0.86	$ (7.63)
Diluted net earnings (loss) per share | $ / shares	$ 0.09	$ (8.51)	$ 0.86	$ (7.63)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Impairment charges		$ 549.0		$ 549.0
Earnings (loss) before income taxes		(481.7)		(410.4)
Income tax provision (benefit)		(40.3)		(16.8)
Net earnings (loss)		$ (441.4)		$ (393.6)
Basic net earnings (loss) per share | $ / shares		$ (8.16)		$ (7.27)
Diluted net earnings (loss) per share | $ / shares		$ (8.16)		$ (7.27)
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Impairment charges		$ 21.0		$ 21.0
Earnings (loss) before income taxes		(21.0)		(21.0)
Income tax provision (benefit)		(1.7)		(1.7)
Net earnings (loss)		$ (19.3)		$ (19.3)
Basic net earnings (loss) per share | $ / shares		$ (0.35)		$ (0.36)
Diluted net earnings (loss) per share | $ / shares		$ (0.35)		$ (0.36)
Accounting standards update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset					$ 57.4
Operating lease, liability					$ 57.5