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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 2,526.4	$ 2,434.0	$ 2,361.8
Workplace Furnishings
Disaggregation of Revenue [Line Items]
Net sales	1,888.0	1,740.3	1,486.2
Workplace Furnishings | Systems, storage, and tables
Disaggregation of Revenue [Line Items]
Net sales	1,147.3	1,057.4	889.6
Workplace Furnishings | Seating
Disaggregation of Revenue [Line Items]
Net sales	583.7	525.4	473.7
Workplace Furnishings | Other
Disaggregation of Revenue [Line Items]
Net sales	157.0	157.5	123.0
Residential building products
Disaggregation of Revenue [Line Items]
Net sales	$ 638.4	$ 693.7	$ 875.6

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