Segment Information (Segment Total Assets Relating To Segments) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,230.5	$ 5,396.4
SB/RH [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,291.2	5,234.8
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,258.6	4,507.6
Operating Segments [Member] | SB/RH [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,258.6	4,507.6
Operating Segments [Member] | Hardware & Home Improvement [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,611.0	1,640.7
Operating Segments [Member] | Hardware & Home Improvement [Member] | SB/RH [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,611.0	1,640.7
Operating Segments [Member] | Global Pet Supplies [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,275.4	1,367.6
Operating Segments [Member] | Global Pet Supplies [Member] | SB/RH [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,275.4	1,367.6
Operating Segments [Member] | Home And Garden [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	538.6	528.4
Operating Segments [Member] | Home And Garden [Member] | SB/RH [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	538.6	528.4
Operating Segments [Member] | Home And Personal Care [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	833.6	970.9
Operating Segments [Member] | Home And Personal Care [Member] | SB/RH [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	833.6	970.9
Corporate [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	971.9	888.8
Corporate [Member] | SB/RH [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 1,032.6	$ 727.2