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Restructuring and Related Activities - Schedule of Incurred Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Sep. 30, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Goodwill impairment |  | $ 0.0 | $ 675.3 | $ 0.0 | $ 675.3 |  |
2024 restructuring plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected restructuring costs | $ 75.0 |  |  | 75.0 |  |  | $ 75.0
Total restructuring-related costs |  |  |  | 10.6 |  | $ 47.8 | 58.4
Bedding Products |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Goodwill impairment |  | 0.0 |  |  | 587.2 | 0.7 |
Other restructuring | 2024 restructuring plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected restructuring costs | 65.0 |  |  | 65.0 |  |  | 65.0
Total restructuring-related costs | 1.0 | 11.7 |  | 8.6 | 31.1 | 43.6 | 52.2
Other restructuring | Bedding Products | 2024 restructuring plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Total restructuring-related costs | 0.3 | $ 7.4 |  | 4.6 | $ 24.0 |  |
Net cash restructuring and restructuring-related | 2024 restructuring plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected restructuring costs | 40.0 |  |  | 40.0 |  |  | 40.0
Total restructuring-related costs |  |  |  | 7.8 |  | 30.3 | 38.1
Net non-cash restructuring and restructuring-related | 2024 restructuring plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected restructuring costs | 25.0 |  |  | 25.0 |  |  | 25.0
Total restructuring-related costs |  |  |  | 0.8 |  | 13.3 | 14.1
Goodwill and long-lived asset impairment costs | 2024 restructuring plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected restructuring costs | $ 10.0 |  |  | 10.0 |  |  | 10.0
Total restructuring-related costs |  |  |  | $ 2.0 |  | $ 4.2 | $ 6.2

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