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GOODWILL IMPAIRMENT TESTING - Summary of Goodwill (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |
Goodwill value | $ 1,475.4 |  | $ 1,474.4 |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% |  | 3.00% |
Bedding |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill value | $ 900.5 |  | $ 900.3 |
Percentage of fair value in excess of carrying amount (as a percent) |  | 40.00% |  | 54.00%
Work Furniture |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill value | 97.9 |  | 98.4 |
Percentage of fair value in excess of carrying amount (as a percent) |  | 74.00% |  | 78.00%
Aerospace Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill value | 66.5 |  | 66.3 |
Percentage of fair value in excess of carrying amount (as a percent) |  | 44.00% |  | 40.00%
Hydraulic Cylinders |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill value | $ 43.0 |  | $ 41.5 |
Percentage of fair value in excess of carrying amount (as a percent) |  | 18.00% |  | 32.00%
Minimum |  |  |  |
Goodwill [Line Items] |  |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales | 1.00% |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 1.00% |
Discount rate ranges (as a percent) | 8.00% |  | 10.00% |
Maximum |  |  |  |
Goodwill [Line Items] |  |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales | 17.00% |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 9.00% |
Discount rate ranges (as a percent) | 12.00% |  | 12.00% |
Less than 50% |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill value | $ 1,010.0 |  | $ 107.8 |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% |  | 3.00% |
Discount rate ranges (as a percent) |  |  | 12.00% |
Less than 50% | Minimum |  |  |  |
Goodwill [Line Items] |  |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales | 1.00% |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 4.00% |
Discount rate ranges (as a percent) | 10.00% |  |  |
Less than 50% | Maximum |  |  |  |
Goodwill [Line Items] |  |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales | 17.00% |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 9.00% |
Discount rate ranges (as a percent) | 12.00% |  |  |
50% - 100% |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill value | $ 97.9 |  | $ 998.7 |
Compound Annual Growth Rate (CAGR) Range for Sales | 1.00% |  |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% |  | 3.00% |
Discount rate ranges (as a percent) | 8.00% |  | 10.00% |
50% - 100% | Minimum |  |  |  |
Goodwill [Line Items] |  |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 3.00% |
50% - 100% | Maximum |  |  |  |
Goodwill [Line Items] |  |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 5.00% |
101% - 300% |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill value | $ 367.5 |  | $ 248.3 |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% |  | 3.00% |
Discount rate ranges (as a percent) |  |  | 10.00% |
101% - 300% | Minimum |  |  |  |
Goodwill [Line Items] |  |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales | 3.00% |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 1.00% |
Discount rate ranges (as a percent) | 8.00% |  |  |
101% - 300% | Maximum |  |  |  |
Goodwill [Line Items] |  |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales | 6.00% |  |  |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 3.00% |
Discount rate ranges (as a percent) | 10.00% |  |  |
Greater than 300% |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill value |  |  | $ 119.6 |
Compound Annual Growth Rate (CAGR) Range for Sales |  |  | 8.00% |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow |  |  | 3.00% |
Discount rate ranges (as a percent) |  |  | 12.00% |

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