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Business Segment Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) customer segment country | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of business segments | segment | 2 |  |
Number of countries product is sold in | country | 100 |  |
Number of wholesale customers products are sold to | customer | 10,000 |  |
Segment information [Abstract] |  |  |
Total assets | $ 4,553.9 | $ 4,359.8 |
Property, plant and equipment, net | 878.3 | 791.1 |
Operating lease right-of-use assets | 636.5 | 506.8 |
Net sales | 4,925.4 | 4,921.2 | $ 4,930.8
Inter-segment royalty expense (income) | 0.0 | 0.0 | 0.0
Gross profit | 2,128.7 | 2,049.6 | 2,158.7
Operating income (loss) | 607.2 | 680.6 | 912.3
Income (loss) from continuing operations before income taxes | 474.1 | 577.2 | 824.0
Depreciation and amortization | 183.0 | 180.2 | 174.6
Capital expenditures | $ 185.4 | $ 306.5 | 123.3
Revenue | Sales Channel Concentration Risk | Direct Channel |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage | 23.90% | 23.30% |
Revenue | Customer Concentration Risk | Customer A |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage | 15.00% | 15.00% |
Bedding sales |  |  |
Segment information [Abstract] |  |  |
Net sales |  |  | 4,512.9
Other sales |  |  |
Segment information [Abstract] |  |  |
Net sales |  |  | 417.9
United States |  |  |
Segment information [Abstract] |  |  |
Property, plant and equipment, net | $ 764.1 | $ 682.0 |
Operating lease right-of-use assets | 444.2 | 339.6 |
Net sales |  |  | 3,751.3
All other |  |  |
Segment information [Abstract] |  |  |
Property, plant and equipment, net | 114.2 | 109.1 |
Net sales | 1,364.6 | 1,325.2 | 1,179.5
UNITED KINGDOM |  |  |
Segment information [Abstract] |  |  |
Operating lease right-of-use assets | 146.5 | 122.9 |
All other |  |  |
Segment information [Abstract] |  |  |
Operating lease right-of-use assets | 45.8 | 44.3 |
Operating Segments |  |  |
Segment information [Abstract] |  |  |
Net sales | 4,925.4 | 4,921.2 | 4,930.8
Operating Segments | Bedding sales |  |  |
Segment information [Abstract] |  |  |
Net sales | 4,464.4 | 4,477.8 |
Operating Segments | Other sales |  |  |
Segment information [Abstract] |  |  |
Net sales | 461.0 | 443.4 |
Operating Segments | United States |  |  |
Segment information [Abstract] |  |  |
Net sales | 3,560.8 | 3,596.0 | 3,751.3
Operating Segments | All other |  |  |
Segment information [Abstract] |  |  |
Net sales | 1,364.6 | 1,325.2 | 1,179.5
Operating Segments | North America |  |  |
Segment information [Abstract] |  |  |
Total assets | 5,291.0 | 5,161.7 |
Property, plant and equipment, net | 753.8 | 672.1 |
Operating lease right-of-use assets | 453.5 | 349.0 |
Net sales | 3,855.5 | 3,886.1 | 4,079.2
Inter-segment royalty expense (income) | 33.7 | 15.0 | 8.7
Gross profit | 1,537.5 | 1,487.3 | 1,678.0
Operating income (loss) | 643.1 | 642.4 | 856.7
Income (loss) from continuing operations before income taxes | 634.2 | 638.6 | 853.2
Depreciation and amortization | 102.2 | 96.9 | 87.7
Capital expenditures | 158.8 | 267.4 | 89.7
Operating Segments | North America | Bedding sales |  |  |
Segment information [Abstract] |  |  |
Net sales | 3,585.2 | 3,618.7 | 3,825.9
Operating Segments | North America | Other sales |  |  |
Segment information [Abstract] |  |  |
Net sales | 270.3 | 267.4 | 253.3
Operating Segments | North America | United States |  |  |
Segment information [Abstract] |  |  |
Net sales | 3,560.8 | 3,596.0 | 3,751.3
Operating Segments | North America | All other |  |  |
Segment information [Abstract] |  |  |
Net sales | 294.7 | 290.1 | 327.9
Operating Segments | International |  |  |
Segment information [Abstract] |  |  |
Total assets | 1,405.2 | 1,181.5 |
Property, plant and equipment, net | 91.3 | 87.3 |
Operating lease right-of-use assets | 180.2 | 154.1 |
Net sales | 1,069.9 | 1,035.1 | 851.6
Inter-segment royalty expense (income) | (33.7) | (15.0) | (8.7)
Gross profit | 591.2 | 562.3 | 480.7
Operating income (loss) | 170.9 | 187.2 | 200.0
Income (loss) from continuing operations before income taxes | 171.4 | 183.4 | 198.9
Depreciation and amortization | 25.6 | 23.7 | 18.1
Capital expenditures | 18.1 | 33.1 | 18.0
Operating Segments | International | Bedding sales |  |  |
Segment information [Abstract] |  |  |
Net sales | 879.2 | 859.1 | 687.0
Operating Segments | International | Other sales |  |  |
Segment information [Abstract] |  |  |
Net sales | 190.7 | 176.0 | 164.6
Operating Segments | International | United States |  |  |
Segment information [Abstract] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Operating Segments | International | All other |  |  |
Segment information [Abstract] |  |  |
Net sales | 1,069.9 | 1,035.1 | 851.6
Corporate |  |  |
Segment information [Abstract] |  |  |
Total assets | 1,269.5 | 1,077.1 |
Property, plant and equipment, net | 33.2 | 31.7 |
Operating lease right-of-use assets | 2.8 | 3.7 |
Net sales | 0.0 | 0.0 | 0.0
Inter-segment royalty expense (income) | 0.0 | 0.0 | 0.0
Gross profit | 0.0 | 0.0 | 0.0
Operating income (loss) | (206.8) | (149.0) | (144.4)
Income (loss) from continuing operations before income taxes | (331.5) | (244.8) | (228.1)
Depreciation and amortization | 55.2 | 59.6 | 68.8
Capital expenditures | 8.5 | 6.0 | 15.6
Corporate | Bedding sales |  |  |
Segment information [Abstract] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Corporate | Other sales |  |  |
Segment information [Abstract] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Inter-segment eliminations |  |  |
Segment information [Abstract] |  |  |
Total assets | (3,411.8) | (3,060.5) |
Net sales | (1.7) | (2.8) | (3.0)
Inter-segment eliminations | North America |  |  |
Segment information [Abstract] |  |  |
Net sales | 1.2 | 1.7 | 1.8
Inter-segment eliminations | International |  |  |
Segment information [Abstract] |  |  |
Net sales | $ 0.5 | $ 1.1 | $ 1.2

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