Revenue - By Major Source (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net trade sales	$ 1,332.9	$ 1,319.2	$ 1,269.6	$ 1,150.9	$ 1,182.0	$ 1,207.6	$ 845.1	$ 1,045.5	$ 5,072.6	$ 4,280.2	$ 4,752.5
Bedding Products
Disaggregation of Revenue [Line Items]
Net trade sales									2,455.9	2,039.3	2,254.3
Bedding Products | Bedding group
Disaggregation of Revenue [Line Items]
Net trade sales									2,455.9	2,039.3	2,254.3
Specialized Products
Disaggregation of Revenue [Line Items]
Net trade sales									998.9	891.2	1,066.8
Specialized Products | Automotive Group
Disaggregation of Revenue [Line Items]
Net trade sales									801.4	719.0	816.1
Specialized Products | Aerospace Products Group
Disaggregation of Revenue [Line Items]
Net trade sales									102.9	102.4	157.7
Specialized Products | Hydraulic Cylinders Group
Disaggregation of Revenue [Line Items]
Net trade sales									94.6	69.8	93.0
Furniture, Flooring & Textile Products
Disaggregation of Revenue [Line Items]
Net trade sales									1,617.8	1,349.7	1,431.4
Furniture, Flooring & Textile Products | Home Furniture Group
Disaggregation of Revenue [Line Items]
Net trade sales									434.3	320.9	357.4
Furniture, Flooring & Textile Products | Work Furniture Group
Disaggregation of Revenue [Line Items]
Net trade sales									284.1	231.1	297.3
Furniture, Flooring & Textile Products | Flooring & Textile Products Group
Disaggregation of Revenue [Line Items]
Net trade sales									$ 899.4	$ 797.7	$ 776.7