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Acquisitions and Divestitures - Sherwood Bedding Price Purchase Allocation (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 766.3 |  | $ 732.3 | $ 723.0
Sherwood Bedding |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Working capital (accounts receivable and inventory, net of accounts payable and accrued liabilities) |  | $ 5.8 |  |
Property and equipment |  | 10.1 |  |
Goodwill |  | 26.7 |  |
Operating lease right-of-use assets |  | 19.9 |  |
Operating lease liabilities |  | (19.9) |  |
Non-controlling interest |  | (8.4) |  |
Purchase price, net of cash acquired |  | 37.9 |  |
Sherwood Bedding | Customer Relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Customer relationships intangible assets |  | $ 3.7 |  |

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