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Segment Information - Depreciation and Amortization Relating to Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	$ 148.5	$ 180.8	$ 125.3
SB/RH
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	148.5	180.8	124.6
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	133.9	166.2	109.9
Operating Segments | SB/RH
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	133.9	166.2	109.9
Operating Segments | HHI
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	33.9	33.5	40.0
Operating Segments | HHI | SB/RH
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	33.9	33.5	40.0
Operating Segments | GPC
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	44.4	48.8	42.3
Operating Segments | GPC | SB/RH
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	44.4	48.8	42.3
Operating Segments | H&G
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	20.4	19.3	18.8
Operating Segments | H&G | SB/RH
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	20.4	19.3	18.8
Operating Segments | HPC
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	35.2	64.6	8.8
Operating Segments | HPC | SB/RH
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	35.2	64.6	8.8
Corporate and shared operations
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	14.6	14.6	15.4
Corporate and shared operations | SB/RH
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	$ 14.6	$ 14.6	$ 14.7

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

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+ References

No definition available.

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