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Impairment Charges - Summary of Changes In The Carrying Amounts Of Goodwill (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill value | $ 814.7 | $ 1,489.8 |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% | 3.00% |  |
Bedding |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill value | $ 319.8 | $ 906.5 |  |
Percentage of fair value in excess of carrying amount (as a percent) |  | 19.00% |  | 40.00%
Aerospace Products |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill value | 67.7 | $ 67.0 |  |
Percentage of fair value in excess of carrying amount (as a percent) |  |  | 21.00% | 44.00%
Work Furniture |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill value | $ 55.4 | 99.6 |  |
Percentage of fair value in excess of carrying amount (as a percent) |  |  |  | 74.00%
Hydraulic Cylinders |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill value |  | $ 44.6 |  |
Percentage of fair value in excess of carrying amount (as a percent) |  |  |  | 18.00%
Minimum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Compound annual growth rate range for sales | (1.00%) | 1.00% |  |
Discount rate ranges (as a percent) | 14.00% | 8.00% |  |
Maximum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Compound annual growth rate range for sales | 12.00% | 17.00% |  |
Discount rate ranges (as a percent) | 17.00% | 12.00% |  |
Less than 50% |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value over Carrying Value divided by Carrying Value | 50.00% | 50.00% |  |
Goodwill value | $ 442.9 | $ 1,018.1 |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% | 3.00% |  |
Less than 50% | Minimum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Compound annual growth rate range for sales | (1.00%) | 1.00% |  |
Discount rate ranges (as a percent) | 14.00% | 10.00% |  |
Less than 50% | Maximum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Compound annual growth rate range for sales | 12.00% | 17.00% |  |
Discount rate ranges (as a percent) | 17.00% | 12.00% |  |
50% - 100% |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill value |  | $ 99.6 |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow |  | 3.00% |  |
Discount rate ranges (as a percent) |  | 8.00% |  |
50% - 100% | Minimum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value over Carrying Value divided by Carrying Value |  | 50.00% |  |
Compound annual growth rate range for sales |  |  |  |
50% - 100% | Maximum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value over Carrying Value divided by Carrying Value |  | 100.00% |  |
Compound annual growth rate range for sales |  | 1.00% |  |
101% - 300% |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill value | $ 371.8 | $ 372.1 |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% | 3.00% |  |
101% - 300% | Minimum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value over Carrying Value divided by Carrying Value | 101.00% | 101.00% |  |
Compound annual growth rate range for sales | 3.00% | 3.00% |  |
Discount rate ranges (as a percent) |  | 8.00% |  |
101% - 300% | Maximum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value over Carrying Value divided by Carrying Value | 300.00% | 300.00% |  |
Compound annual growth rate range for sales | 7.00% | 6.00% |  |
Discount rate ranges (as a percent) | 14.00% | 10.00% |  |

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