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Segment Information - Segment Total Assets Relating to Segments (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 5,107.3 | $ 5,246.0
SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 5,184.3 | 5,291.2
Operating Segments |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 4,358.3 | 4,258.6
Operating Segments | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 4,358.3 | 4,258.6
Operating Segments | HHI |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,786.5 | 1,611.0
Operating Segments | HHI | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,786.5 | 1,611.0
Operating Segments | GPC |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,200.4 | 1,275.4
Operating Segments | GPC | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,200.4 | 1,275.4
Operating Segments | H&G |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 546.1 | 538.6
Operating Segments | H&G | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 546.1 | 538.6
Operating Segments | HPC |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 825.3 | 833.6
Operating Segments | HPC | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 825.3 | 833.6
Corporate and shared operations |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 749.0 | 987.4
Corporate and shared operations | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 826.0 | $ 1,032.6

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