Acquisitions and Divestitures - Fair Value, Valuation and Useful Lives of Acquired Intangible Assets (Details) - USD ($) $ in Millions				12 Months Ended
	Jul. 19, 2021	Dec. 02, 2019	Oct. 25, 2019	May 28, 2022
Knoll
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments				$ 756.6
Knoll | Tradename
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments				418.0
Knoll | Backlog
Business Acquisition [Line Items]
Useful Life (years)	1 year
Total finite and indefinite-lived intangible assets acquired, net of adjustments				27.6
Knoll | Tradename
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments				14.0
Knoll | Tradename | Minimum
Business Acquisition [Line Items]
Useful Life (years)	5 years
Knoll | Tradename | Maximum
Business Acquisition [Line Items]
Useful Life (years)	10 years
Knoll | Designs
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments				40.0
Knoll | Designs | Minimum
Business Acquisition [Line Items]
Useful Life (years)	9 years
Knoll | Designs | Maximum
Business Acquisition [Line Items]
Useful Life (years)	15 years
Knoll | Customer Relationships
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments				$ 257.0
Knoll | Customer Relationships | Minimum
Business Acquisition [Line Items]
Useful Life (years)	2 years
Knoll | Customer Relationships | Maximum
Business Acquisition [Line Items]
Useful Life (years)	15 years
naughtone
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments			$ 38.9
naughtone | Tradename
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments			$ 8.5
naughtone | Inventory Step-up
Business Acquisition [Line Items]
Useful Life (years)			3 months 18 days
Total finite and indefinite-lived intangible assets acquired, net of adjustments			$ 0.2
naughtone | Backlog
Business Acquisition [Line Items]
Useful Life (years)			3 months 18 days
Total finite and indefinite-lived intangible assets acquired, net of adjustments			$ 0.8
naughtone | Customer Relationships
Business Acquisition [Line Items]
Useful Life (years)			9 years
Total finite and indefinite-lived intangible assets acquired, net of adjustments			$ 29.4
HAY
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments		$ 118.9
HAY | Tradename
Business Acquisition [Line Items]
Total finite and indefinite-lived intangible assets acquired, net of adjustments		$ 60.0
HAY | Inventory Step-up
Business Acquisition [Line Items]
Useful Life (years)		9 months 18 days
Total finite and indefinite-lived intangible assets acquired, net of adjustments		$ 3.4
HAY | Backlog
Business Acquisition [Line Items]
Useful Life (years)		3 months 18 days
Total finite and indefinite-lived intangible assets acquired, net of adjustments		$ 1.7
HAY | Deferred Revenue
Business Acquisition [Line Items]
Useful Life (years)		1 month 6 days
Total finite and indefinite-lived intangible assets acquired, net of adjustments		$ (2.2)
HAY | Product Development
Business Acquisition [Line Items]
Useful Life (years)		8 years
Total finite and indefinite-lived intangible assets acquired, net of adjustments		$ 22.0
HAY | Customer Relationships
Business Acquisition [Line Items]
Useful Life (years)		9 years
Total finite and indefinite-lived intangible assets acquired, net of adjustments		$ 34.0