Reportable Segment Information - Schedule of Reportable Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024	Dec. 28, 2024
Segment Reporting Information [Line Items]
Net sales	$ 683.8	$ 672.2	$ 1,950.6	$ 1,883.9
Cost of Sales:	395.7	393.4	1,138.0	1,110.9
Selling and Administrative Expenses:	222.7	208.4	645.7	617.3
Restructuring, Impairment, and Loss on Divestiture:	0.8	1.6	9.7	3.7
Total	64.6	68.9	157.2	151.9
Interest Expense, Net	7.2	7.1	18.9	22.1
Income Before Income Taxes	57.4	61.8	138.3	129.8
Depreciation and Amortization Expense:	24.9	27.3	75.4	80.1
Capital Expenditures (including capitalized software):	19.6	14.5	50.8	43.2
Identifiable Assets:	1,843.0		1,843.0		$ 1,875.1
Workplace furnishings
Segment Reporting Information [Line Items]
Net sales	516.9	505.1	1,473.9	1,425.1
Residential building products
Segment Reporting Information [Line Items]
Net sales	166.9	167.1	476.7	458.8
Operating segments | Workplace furnishings
Segment Reporting Information [Line Items]
Net sales	516.9	505.1	1,473.9	1,425.1
Cost of Sales:	304.1	301.3	875.9	855.3
Selling and Administrative Expenses:	149.5	145.6	442.6	428.8
Restructuring, Impairment, and Loss on Divestiture:	0.8	0.5	9.1	2.6
Total	62.5	57.7	146.3	138.3
Depreciation and Amortization Expense:	16.2	18.7	49.6	54.3
Capital Expenditures (including capitalized software):	16.8	11.2	37.6	29.7
Identifiable Assets:	1,247.3		1,247.3		1,282.6
Operating segments | Residential building products
Segment Reporting Information [Line Items]
Net sales	166.9	167.1	476.7	458.8
Cost of Sales:	91.6	92.1	262.1	255.5
Selling and Administrative Expenses:	45.3	44.0	135.9	131.1
Restructuring, Impairment, and Loss on Divestiture:	0.0	1.1	0.0	1.1
Total	30.0	29.9	78.6	71.0
Depreciation and Amortization Expense:	3.8	3.6	11.2	10.7
Capital Expenditures (including capitalized software):	2.1	1.7	7.6	6.0
Identifiable Assets:	466.2		466.2		465.8
General corporate
Segment Reporting Information [Line Items]
Selling and Administrative Expenses:	27.9	18.8	67.2	57.4
Restructuring, Impairment, and Loss on Divestiture:	0.0	0.0	0.6	0.0
Total	(27.9)	(18.8)	(67.7)	(57.4)
Depreciation and Amortization Expense:	4.9	5.0	14.7	15.2
Capital Expenditures (including capitalized software):	0.7	$ 1.6	5.6	$ 7.5
Identifiable Assets:	$ 129.6		$ 129.6		$ 126.7