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Restructuring and Related Activities - Summary of Incurred Costs (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) facility | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Amount of total that represents net cash charges |  |  | $ 2.7 |
2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total restructuring-related costs | $ 12.3 | $ 34.3 |  |
Amount of total that represents net cash charges | 11.0 | $ 26.6 |  |
Bedding Products | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of facilities | facility |  | 50 |  |
Aerospace business | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total restructuring-related costs | 1.0 |  |  |
Net restructuring and restructuring-related | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total restructuring-related costs | 11.7 | $ 31.1 |  |
Net restructuring and restructuring-related | Bedding Products | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total restructuring-related costs | 7.4 | 24.0 |  |
Impairment costs associated with this plan (See Note F) | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total restructuring-related costs | 0.6 | 3.2 |  |
Minimum | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | 65.0 | 65.0 |  |
Expected cash charges | 30.0 | $ 30.0 |  |
Minimum | Forecast | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs |  |  |  | $ 40.0
Minimum | Bedding Products | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of facilities consolidated | facility |  | 15 |  |
Minimum | Net restructuring and restructuring-related | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | 40.0 | $ 40.0 |  |
Minimum | Impairment costs associated with this plan (See Note F) | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | 25.0 | 25.0 |  |
Maximum | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | 85.0 | 85.0 |  |
Expected cash charges | 40.0 | $ 40.0 |  |
Maximum | Forecast | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs |  |  |  | $ 50.0
Maximum | Bedding Products | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of facilities consolidated | facility |  | 20 |  |
Maximum | Net restructuring and restructuring-related | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | 55.0 | $ 55.0 |  |
Maximum | Impairment costs associated with this plan (See Note F) | 2024 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | $ 30.0 | $ 30.0 |  |

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