Net Sales - Sales (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 1,208.1	$ 1,239.5
Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	1,208.1	1,239.5
Operating Segments | United States
Disaggregation of Revenue [Line Items]
Net sales	854.9	864.3
Operating Segments | All Other
Disaggregation of Revenue [Line Items]
Net sales	353.2	375.2
Operating Segments | Bedding
Disaggregation of Revenue [Line Items]
Net sales	1,092.3	1,121.4
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Net sales	115.8	118.1
Operating Segments | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	912.6	924.1
Operating Segments | Direct
Disaggregation of Revenue [Line Items]
Net sales	295.5	315.4
Operating Segments | North America
Disaggregation of Revenue [Line Items]
Net sales	919.6	931.4
Operating Segments | North America | United States
Disaggregation of Revenue [Line Items]
Net sales	854.9	864.3
Operating Segments | North America | All Other
Disaggregation of Revenue [Line Items]
Net sales	64.7	67.1
Operating Segments | North America | Bedding
Disaggregation of Revenue [Line Items]
Net sales	854.3	864.9
Operating Segments | North America | Other
Disaggregation of Revenue [Line Items]
Net sales	65.3	66.5
Operating Segments | North America | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	804.3	811.3
Operating Segments | North America | Direct
Disaggregation of Revenue [Line Items]
Net sales	115.3	120.1
Operating Segments | International
Disaggregation of Revenue [Line Items]
Net sales	288.5	308.1
Operating Segments | International | United States
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Operating Segments | International | All Other
Disaggregation of Revenue [Line Items]
Net sales	288.5	308.1
Operating Segments | International | Bedding
Disaggregation of Revenue [Line Items]
Net sales	238.0	256.5
Operating Segments | International | Other
Disaggregation of Revenue [Line Items]
Net sales	50.5	51.6
Operating Segments | International | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	108.3	112.8
Operating Segments | International | Direct
Disaggregation of Revenue [Line Items]
Net sales	$ 180.2	$ 195.3