Reportable Segment Information - Schedule of Reportable Segment Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 2,526.4	$ 2,434.0	$ 2,361.8
Cost of Sales:	1,493.0	1,485.7	1,526.9
Selling and Administrative Expenses:	820.7	813.2	723.4
Restructuring and impairment charges	6.2	44.8	6.7
Gain on sale of subsidiary	0.0	0.0	50.4
Total	206.5	90.3	155.2
Interest expense, net	27.2	25.5	8.8
Income Before Income Taxes	179.3	64.8	146.4
Depreciation and Amortization Expense:	107.8	94.9	84.2
Capital Expenditures (including capitalized software):	52.9	79.1	68.4
Identifiable Assets:	1,875.1	1,928.8	1,414.5
Workplace furnishings
Segment Reporting Information [Line Items]
Net sales	1,888.0	1,740.3	1,486.2
Residential building products
Segment Reporting Information [Line Items]
Net sales	638.4	693.7	875.6
Operating Segments | Workplace furnishings
Segment Reporting Information [Line Items]
Net sales	1,888.0	1,740.3	1,486.2
Cost of Sales:	1,140.6	1,091.8	1,017.7
Selling and Administrative Expenses:	573.3	537.3	459.4
Restructuring and impairment charges	5.1	42.5	5.7
Total	169.1	68.6	3.4
Depreciation and Amortization Expense:	73.5	59.5	45.7
Capital Expenditures (including capitalized software):	36.2	62.7	40.4
Identifiable Assets:	1,282.6	1,311.4	761.5
Operating Segments | Residential building products
Segment Reporting Information [Line Items]
Net sales	638.4	693.7	875.6
Cost of Sales:	352.4	393.9	509.2
Selling and Administrative Expenses:	174.0	183.2	207.7
Restructuring and impairment charges	1.1	0.0	0.0
Total	110.8	116.6	158.7
Depreciation and Amortization Expense:	14.3	13.7	12.6
Capital Expenditures (including capitalized software):	8.2	12.6	16.2
Identifiable Assets:	465.8	467.1	493.0
General corporate
Segment Reporting Information [Line Items]
Selling and Administrative Expenses:	73.4	92.6	56.3
Restructuring and impairment charges	0.0	2.3	1.0
Total	(73.4)	(94.9)	(57.3)
Depreciation and Amortization Expense:	20.1	21.6	25.9
Capital Expenditures (including capitalized software):	8.4	3.7	11.7
Identifiable Assets:	$ 126.7	$ 150.3	$ 160.0