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Impairment Charges (Components of Fair Values In Relation to Their Respective Carrying Values) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill value | $ 1,489.8 | $ 1,489.8 | $ 1,474.4 |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% | 3.00% | 3.00% |  |
Less than 50% |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill value | $ 1,018.1 | $ 1,018.1 | $ 107.8 |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% | 3.00% | 3.00% |  |
Discount Rate Ranges |  |  | 12.00% |  |
50-100% |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill value | $ 99.6 | $ 99.6 | $ 998.7 |  |
Compound Annual Growth Rate Range for Sales |  | 1.00% |  |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% | 3.00% | 3.00% |  |
Discount Rate Ranges |  | 8.00% | 10.00% |  |
101-300% |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill value | $ 372.1 | $ 372.1 | $ 248.3 |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow | 3.00% | 3.00% | 3.00% |  |
Discount Rate Ranges |  |  | 10.00% |  |
Greater than 300% |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value over Carrying Value divided by Carrying Value |  |  | 300.00% |  |
Goodwill value |  |  | $ 119.6 |  |
Compound Annual Growth Rate Range for Sales |  |  | 8.00% |  |
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow |  |  | 3.00% |  |
Discount Rate Ranges |  |  | 12.00% |  |
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 |  | 8.00% | 10.00% |  |
Minimum | Less than 50% |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Compound Annual Growth Rate Range for Sales |  | 1.00% | 4.00% |  |
Discount Rate Ranges |  | 10.00% |  |  |
Minimum | 50-100% |  |  |  |  |
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% |  |
Compound Annual Growth Rate Range for Sales |  |  | 3.00% |  |
Minimum | 101-300% |  |  |  |  |
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% | 1.00% |  |
Discount Rate Ranges |  | 8.00% |  |  |
Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Compound Annual Growth Rate Range for Sales |  | 17.00% | 9.00% |  |
Discount Rate Ranges |  | 12.00% | 12.00% |  |
Maximum | 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% |  |
Compound Annual Growth Rate Range for Sales |  | 17.00% | 9.00% |  |
Discount Rate Ranges |  | 12.00% |  |  |
Maximum | 50-100% |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value over Carrying Value divided by Carrying Value |  | 100.00% | 100.00% |  |
Compound Annual Growth Rate Range for Sales |  |  | 5.00% |  |
Maximum | 101-300% |  |  |  |  |
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 |  | 6.00% | 3.00% |  |
Discount Rate Ranges |  | 10.00% |  |  |
Bedding |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill value | $ 906.5 | $ 906.5 | $ 900.3 |  |
Compound Annual Growth Rate Range for Sales | 2.00% |  |  |  |
Discount Rate Ranges | 10.00% |  |  |  |
Fair value in excess of carrying value for the goodwill impairment testing performed (as a percent) | 19.00% | 19.00% |  | 40.00% | 54.00%
Work Furniture |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill value | $ 99.6 | $ 99.6 | 98.4 |  |
Fair value in excess of carrying value for the goodwill impairment testing performed (as a percent) |  |  |  | 74.00% | 78.00%
Aerospace Products |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill value | 67.0 | 67.0 | 66.3 |  |
Fair value in excess of carrying value for the goodwill impairment testing performed (as a percent) |  |  |  | 44.00% | 40.00%
Hydraulic Cylinders |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill value | $ 44.6 | $ 44.6 | $ 41.5 |  |
Fair value in excess of carrying value for the goodwill impairment testing performed (as a percent) |  |  |  | 18.00% | 32.00%

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