Restructuring and Impairment - Schedule of Restructuring and Impairment Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 11.2	$ 45.7	$ 15.5
Inventory valuation | Workplace Furnishings
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	(0.3)	8.1
Facility set-up and consolidation costs | Workplace Furnishings
Restructuring Cost and Reserve [Line Items]
Restructuring costs	5.0	1.2	0.7
Long-lived asset charges | Workplace Furnishings
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	2.3	5.2
Exit costs | Workplace Furnishings
Restructuring Cost and Reserve [Line Items]
Restructuring costs	5.1	9.2	0.5
Exit costs | General Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.8	0.0
Goodwill and intangible asset impairment | Workplace Furnishings
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	31.0	0.0
Reorganization costs | Residential Building Products
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1.1	0.0	0.0
Investment impairment | General Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.0	$ 1.5	$ 1.0