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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 683.8	$ 672.2	$ 1,950.6	$ 1,883.9
Workplace furnishings
Disaggregation of Revenue [Line Items]
Net sales	516.9	505.1	1,473.9	1,425.1
Workplace furnishings | Systems, storage, and tables
Disaggregation of Revenue [Line Items]
Net sales	309.9	301.5	907.1	871.8
Workplace furnishings | Seating
Disaggregation of Revenue [Line Items]
Net sales	161.1	150.3	444.4	421.8
Workplace furnishings | Other
Disaggregation of Revenue [Line Items]
Net sales	45.9	53.3	122.5	131.6
Residential building products
Disaggregation of Revenue [Line Items]
Net sales	$ 166.9	$ 167.1	$ 476.7	$ 458.8

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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