Reportable Segment Information - Reportable Segment Data (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023	Dec. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 588.0	$ 479.1
Income (Loss) Before Income Taxes:	29.7	6.4
Interest expense, net	7.6	2.7
Income before income taxes	22.0	3.8
Depreciation and Amortization Expense:	26.4	20.1
Capital Expenditures (including capitalized software):	11.2	20.0
Identifiable Assets:	1,912.6		$ 1,928.8
Workplace furnishings
Segment Reporting Information [Line Items]
Net sales	439.8	299.6
Residential building products
Segment Reporting Information [Line Items]
Net sales	148.2	179.4
Operating segments | Workplace furnishings
Segment Reporting Information [Line Items]
Net sales	439.8	299.6
Income (Loss) Before Income Taxes:	26.3	(4.0)
Depreciation and Amortization Expense:	17.8	11.2
Capital Expenditures (including capitalized software):	6.2	13.9
Identifiable Assets:	1,302.9		1,311.4
Operating segments | Residential building products
Segment Reporting Information [Line Items]
Net sales	148.2	179.4
Income (Loss) Before Income Taxes:	21.4	28.1
Depreciation and Amortization Expense:	3.5	3.3
Capital Expenditures (including capitalized software):	2.5	5.0
Identifiable Assets:	471.3		467.1
General corporate
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes:	(18.0)	(17.7)
Depreciation and Amortization Expense:	5.1	5.7
Capital Expenditures (including capitalized software):	2.5	$ 1.1
Identifiable Assets:	$ 138.3		$ 150.3