Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 711.6	$ 598.8	$ 1,754.2	$ 1,792.9
Workplace furnishings
Disaggregation of Revenue [Line Items]
Net sales	536.8	375.2	1,249.5	1,135.0
Workplace furnishings \| Systems and storage
Disaggregation of Revenue [Line Items]
Net sales	320.7	224.9	754.4	673.9
Workplace furnishings \| Seating
Disaggregation of Revenue [Line Items]
Net sales	160.5	114.8	377.3	354.7
Workplace furnishings \| Other
Disaggregation of Revenue [Line Items]
Net sales	55.6	35.5	117.8	106.4
Residential building products
Disaggregation of Revenue [Line Items]
Net sales	$ 174.8	$ 223.6	$ 504.7	$ 657.9

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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+ Details