Reportable Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2022 USD ($)	Jul. 03, 2021 USD ($)	Jul. 02, 2022 USD ($) segment	Jul. 03, 2021 USD ($)	Jan. 01, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Net Sales:	$ 621.7	$ 510.5	$ 1,194.1	$ 994.7
Income (Loss) Before Income Taxes:	29.9	24.7	50.3	47.3
Interest expense, net	2.1	1.9	4.1	3.6
Total	27.8	22.8	46.2	43.7
Depreciation and Amortization Expense:	21.3	20.7	42.4	41.1
Capital Expenditures (including capitalized software):	15.0	13.3	33.2	32.3
Identifiable Assets:	1,586.7		1,586.7		$ 1,497.9
Workplace furnishings
Segment Reporting Information [Line Items]
Net Sales:	406.7	344.1	759.8	646.9
Residential building products
Segment Reporting Information [Line Items]
Net Sales:	215.1	166.3	434.3	347.9
Operating segments | Workplace furnishings
Segment Reporting Information [Line Items]
Net Sales:	406.7	344.1	759.8	646.9
Income (Loss) Before Income Taxes:	11.9	8.8	5.5	5.7
Depreciation and Amortization Expense:	11.7	12.1	23.2	24.0
Capital Expenditures (including capitalized software):	8.2	7.0	16.4	17.5
Identifiable Assets:	889.2		889.2		809.0
Operating segments | Residential building products
Segment Reporting Information [Line Items]
Net Sales:	215.1	166.3	434.3	347.9
Income (Loss) Before Income Taxes:	37.0	30.5	77.3	70.4
Depreciation and Amortization Expense:	3.1	2.4	6.1	4.9
Capital Expenditures (including capitalized software):	2.7	1.9	8.5	6.7
Identifiable Assets:	516.3		516.3		479.5
General corporate
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes:	(19.0)	(14.6)	(32.5)	(28.8)
Depreciation and Amortization Expense:	6.6	6.2	13.1	12.2
Capital Expenditures (including capitalized software):	4.1	$ 4.4	8.4	$ 8.1
Identifiable Assets:	$ 181.2		$ 181.2		$ 209.5