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Business Segment Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
country
segment
customer
Dec. 31, 2019
USD ($)
Dec. 31, 2018
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 $ 3,308.6 $ 3,061.8  
Total property, plant and equipment, net 507.9 435.8  
Operating lease right-of-use assets 304.3 245.4  
Net sales 3,676.9 3,106.0 $ 2,702.9
Inter-segment royalty expense (income) 0.0 0.0 0.0
Gross profit 1,638.4 1,342.2 1,120.7
Operating income (loss) 532.1 346.7 256.3
Income (loss) from continuing operations before income taxes 452.4 265.5 165.0
Depreciation and amortization 202.5 116.5 111.9
Capital expenditures $ 111.3 88.2 73.6
Revenue | Sales Channel Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk, percentage 13.40%    
Revenue | Customer Concentration Risk | Minimum | Customer A      
Segment Reporting Information [Line Items]      
Concentration risk, percentage 10.00%    
Revenue | Customer Concentration Risk | Maximum | Customer A      
Segment Reporting Information [Line Items]      
Concentration risk, percentage 15.00%    
Bedding sales      
Segment information [Abstract]      
Net sales     2,455.3
Other sales      
Segment information [Abstract]      
Net sales     247.6
United States      
Segment information [Abstract]      
Total property, plant and equipment, net $ 436.2 366.4  
Operating lease right-of-use assets 255.0 198.3  
Net sales     1,928.8
All other      
Segment information [Abstract]      
Total property, plant and equipment, net 71.7 69.4  
Operating lease right-of-use assets 49.3 47.1  
Net sales 790.3 793.9 774.1
Operating Segments      
Segment information [Abstract]      
Net sales 3,676.9 3,106.0 2,702.9
Operating Segments | Bedding sales      
Segment information [Abstract]      
Net sales 3,353.8 2,837.0 2,455.3
Operating Segments | Other sales      
Segment information [Abstract]      
Net sales 323.1 269.0 247.6
Operating Segments | United States      
Segment information [Abstract]      
Net sales 2,886.6 2,312.1 1,928.8
Operating Segments | All other      
Segment information [Abstract]      
Net sales     774.1
Operating Segments | North America Segment      
Segment information [Abstract]      
Total assets 3,740.3 3,187.7  
Total property, plant and equipment, net 415.3 334.8  
Operating lease right-of-use assets 256.6 202.0  
Net sales 3,159.2 2,603.5 2,207.0
Inter-segment royalty expense (income) 9.4 7.6 6.2
Gross profit 1,332.0 1,055.2 843.4
Operating income (loss) 591.4 349.9 256.5
Income (loss) from continuing operations before income taxes 590.1 342.9 248.4
Depreciation and amortization 76.3 65.1 59.5
Capital expenditures 92.6 63.0 53.6
Operating Segments | North America Segment | Bedding sales      
Segment information [Abstract]      
Net sales 2,956.3 2,448.8 2,069.5
Operating Segments | North America Segment | Other sales      
Segment information [Abstract]      
Net sales 202.9 154.7 137.5
Operating Segments | North America Segment | United States      
Segment information [Abstract]      
Net sales 2,886.6 2,312.1 1,928.8
Operating Segments | North America Segment | All other      
Segment information [Abstract]      
Net sales     278.2
Operating Segments | International Segment      
Segment information [Abstract]      
Total assets 639.8 569.0  
Total property, plant and equipment, net 49.8 45.9  
Operating lease right-of-use assets 45.7 42.2  
Net sales 517.7 502.5 495.9
Inter-segment royalty expense (income) (9.4) (7.6) (6.2)
Gross profit 306.4 287.0 277.3
Operating income (loss) 127.6 110.3 101.0
Income (loss) from continuing operations before income taxes 120.2 103.8 93.7
Depreciation and amortization 13.6 13.0 13.0
Capital expenditures 11.0 10.7 13.1
Operating Segments | International Segment | Bedding sales      
Segment information [Abstract]      
Net sales 397.5 388.2 385.8
Operating Segments | International Segment | Other sales      
Segment information [Abstract]      
Net sales 120.2 114.3 110.1
Operating Segments | International Segment | United States      
Segment information [Abstract]      
Net sales 0.0 0.0 0.0
Operating Segments | International Segment | All other      
Segment information [Abstract]      
Net sales     495.9
Corporate      
Segment information [Abstract]      
Total assets 490.3 477.1  
Total property, plant and equipment, net 42.8 55.1  
Operating lease right-of-use assets 2.0 1.2  
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) (186.9) (113.5) (101.2)
Income (loss) from continuing operations before income taxes (257.9) (181.2) (177.1)
Depreciation and amortization 112.6 38.4 39.4
Capital expenditures 7.7 14.5 6.9
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 (1,561.8) (1,172.0)  
Net sales (1.9) (2.3) (1.9)
Inter-segment eliminations | North America Segment      
Segment information [Abstract]      
Net sales 1.2 1.2 1.3
Inter-segment eliminations | International Segment      
Segment information [Abstract]      
Net sales $ 0.7 $ 1.1 $ 0.6