Operating Segments - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2022	May 29, 2021	May 30, 2020
Segment Reporting Information
Net sales	$ 3,946.0	$ 2,465.1	$ 2,486.6
Depreciation and amortization	190.6	87.2	79.5
Operating earnings (loss)	39.8	232.5	(37.9)
Capital expenditures	94.7	59.8	69.0
Goodwill	1,226.2	364.2	346.0
Intersegment Eliminations
Segment Reporting Information
Net sales	(27.4)	0.0	0.0
America's Contract
Segment Reporting Information
Goodwill	191.7	197.2	191.5
America's Contract | Operating segments
Segment Reporting Information
Net sales	1,444.9	1,301.3	1,744.3
Depreciation and amortization	57.5	56.4	49.6
Operating earnings (loss)	44.5	93.6	162.6
Capital expenditures	43.3	45.5	55.2
Goodwill	191.7	197.2	191.5
International Contract
Segment Reporting Information
Net sales	483.2	399.5
Goodwill	82.5	91.3	84.5
International Contract | Operating segments
Segment Reporting Information
Net sales	483.2	399.5	345.9
Depreciation and amortization	13.2	11.2	10.4
Operating earnings (loss)	59.3	48.5	(0.4)
Capital expenditures	8.9	9.1	6.2
Goodwill	82.5	91.3	84.5
Global Retail
Segment Reporting Information
Net sales	856.8	764.3
Global Retail | Operating segments
Segment Reporting Information
Net sales	856.8	764.3	396.4
Depreciation and amortization	16.7	19.6	18.8
Operating earnings (loss)	96.2	143.0	(160.7)
Capital expenditures	19.5	5.2	7.6
Goodwill	68.4	75.7	70.0
Knoll
Segment Reporting Information
Net sales	1,188.5	0.0	0.0
Depreciation and amortization	103.2	0.0	0.0
Operating earnings (loss)	(57.6)	0.0	0.0
Capital expenditures	23.0	0.0	0.0
Goodwill	883.6	0.0	0.0
Corporate
Segment Reporting Information
Depreciation and amortization	0.0	0.0	0.7
Operating earnings (loss)	(102.6)	(52.6)	(39.4)
Capital expenditures	$ 23.0	$ 0.0	$ 0.0