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SEGMENT INFORMATION - Segment Total Assets Relating to Segments (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 3,530.4 | $ 3,313.5
SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 3,607.7 | 3,390.5
Operating Segments |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 3,189.4 | 2,571.4
Operating Segments | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 3,189.4 | 2,571.4
Operating Segments | HPC |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 879.4 | 824.6
Operating Segments | HPC | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 879.4 | 824.6
Operating Segments | GPC |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,456.9 | 1,200.3
Operating Segments | GPC | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,456.9 | 1,200.3
Operating Segments | H&G |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 853.1 | 546.5
Operating Segments | H&G | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 853.1 | 546.5
Corporate and shared operations |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 341.0 | 742.1
Corporate and shared operations | SB/RH |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 418.3 | $ 819.1

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