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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Jan. 01, 2022
Disaggregation of Revenue [Line Items]      
Net sales $ 2,434.0 $ 2,361.8 $ 2,184.4
Workplace Furnishings      
Disaggregation of Revenue [Line Items]      
Net sales 1,740.3 1,486.2 1,434.0
Workplace Furnishings | Systems and storage      
Disaggregation of Revenue [Line Items]      
Net sales 1,057.4 889.6 833.2
Workplace Furnishings | Seating      
Disaggregation of Revenue [Line Items]      
Net sales 525.4 473.7 481.7
Workplace Furnishings | Other      
Disaggregation of Revenue [Line Items]      
Net sales 157.5 123.0 119.0
Residential building products      
Disaggregation of Revenue [Line Items]      
Net sales $ 693.7 $ 875.6 $ 750.4