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Restructuring and Integration Expense - Schedule of Restructuring Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 27, 2021
Nov. 28, 2020
Nov. 27, 2021
Nov. 28, 2020
May 29, 2021
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs $ 0.0 $ 2.4 $ 0.0 $ 1.2  
Americas Contract          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 0.0 0.8 0.0 2.4  
International Contract          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 0.0 1.6 0.0 (1.2)  
Global Retail:          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 0.0 0.0 0.0 0.0  
Knoll          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 0.0 0.0 0.0 0.0  
Knoll Integration          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 24.6 0.0 95.8 0.0  
Knoll Integration | Americas Contract          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 3.4 0.0 4.4 0.0  
Knoll Integration | International Contract          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 0.6 0.0 0.6 0.0  
Knoll Integration | Global Retail:          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 0.5 0.0 0.5 0.0  
Knoll Integration | Knoll          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 11.6 0.0 56.5 0.0  
Knoll Integration | Corporate          
Changes in Restructuring Liability Balance [Roll Forward]          
Restructuring Costs 8.5 $ 0.0 33.8 $ 0.0  
Other Restructuring Plans          
Changes in Restructuring Liability Balance [Roll Forward]          
Beginning balance     1.5    
Restructuring Costs     0.0    
Amounts Paid     (0.3)    
Ending balance 1.2   1.2   $ 1.5
Severance and Employee Benefit | Knoll Integration          
Changes in Restructuring Liability Balance [Roll Forward]          
Beginning balance     0.0    
Restructuring Costs     46.4    
Amounts Paid     (26.6)    
Non-cash costs     (14.2)    
Ending balance 5.6   5.6   0.0
Severance and Employee Benefit | Other Restructuring Plans          
Changes in Restructuring Liability Balance [Roll Forward]          
Beginning balance     0.9    
Restructuring Costs     0.0    
Amounts Paid     (0.3)    
Ending balance 0.6   0.6   0.9
Severance and Employee Benefit | May 2020 Restructuring Plan          
Changes in Restructuring Liability Balance [Roll Forward]          
Beginning balance     1.0    
Restructuring Costs     0.0   3.4
Amounts Paid     (0.6)    
Ending balance 0.4   0.4   1.0
Exit and Disposal Activities | Knoll Integration          
Changes in Restructuring Liability Balance [Roll Forward]          
Beginning balance     0.0    
Restructuring Costs     15.5    
Amounts Paid     0.0    
Non-cash costs     (15.5)    
Ending balance 0.0   0.0   0.0
Exit and Disposal Activities | Other Restructuring Plans          
Changes in Restructuring Liability Balance [Roll Forward]          
Beginning balance     0.6    
Restructuring Costs     0.0    
Amounts Paid     0.0    
Ending balance 0.6   0.6   0.6
Total | Knoll Integration          
Changes in Restructuring Liability Balance [Roll Forward]          
Beginning balance     0.0    
Restructuring Costs     61.9    
Amounts Paid     (26.6)    
Non-cash costs     (29.7)    
Ending balance $ 5.6   $ 5.6   $ 0.0