Reportable Segment Information - Schedule of Reportable Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023	Dec. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 623.7	$ 563.5	$ 1,211.7	$ 1,042.5
Income (Loss) Before Income Taxes:	53.4	(3.6)	83.1	2.9
Interest expense, net	7.4	5.5	15.1	8.2
Income (loss) before income taxes	46.0	(9.0)	68.0	(5.3)
Depreciation and Amortization Expense:	26.4	22.6	52.8	42.7
Capital Expenditures (including capitalized software):	17.5	21.1	28.7	41.2
Identifiable Assets:	1,940.8		1,940.8		$ 1,928.8
Workplace furnishings
Segment Reporting Information [Line Items]
Net sales	480.2	413.0	920.0	712.7
Residential building products
Segment Reporting Information [Line Items]
Net sales	143.5	150.4	291.7	329.8
Operating segments | Workplace furnishings
Segment Reporting Information [Line Items]
Net sales	480.2	413.0	920.0	712.7
Income (Loss) Before Income Taxes:	54.3	15.9	80.6	11.9
Depreciation and Amortization Expense:	17.8	13.8	35.6	25.0
Capital Expenditures (including capitalized software):	12.3	17.9	18.4	31.8
Identifiable Assets:	1,321.8		1,321.8		1,311.4
Operating segments | Residential building products
Segment Reporting Information [Line Items]
Net sales	143.5	150.4	291.7	329.8
Income (Loss) Before Income Taxes:	19.8	15.6	41.1	43.6
Depreciation and Amortization Expense:	3.6	3.4	7.1	6.7
Capital Expenditures (including capitalized software):	1.8	2.4	4.3	7.4
Identifiable Assets:	476.3		476.3		467.1
General corporate
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes:	(20.7)	(35.0)	(38.6)	(52.7)
Depreciation and Amortization Expense:	5.0	5.4	10.1	11.0
Capital Expenditures (including capitalized software):	3.4	$ 0.9	5.9	$ 2.0
Identifiable Assets:	$ 142.7		$ 142.7		$ 150.3