Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 667.1	$ 623.7	$ 1,266.8	$ 1,211.7
Workplace furnishings
Disaggregation of Revenue [Line Items]
Net sales	516.0	480.2	957.0	920.0
Workplace furnishings | Systems, storage, and tables
Disaggregation of Revenue [Line Items]
Net sales	322.0	290.7	597.2	570.3
Workplace furnishings | Seating
Disaggregation of Revenue [Line Items]
Net sales	149.7	145.4	283.3	271.4
Workplace furnishings | Other
Disaggregation of Revenue [Line Items]
Net sales	44.2	44.0	76.5	78.3
Residential building products
Disaggregation of Revenue [Line Items]
Net sales	$ 151.1	$ 143.5	$ 309.8	$ 291.7