Income Taxes Deferred Income Taxes, Income Taxes Receivable, Income Taxes Payable (Details) - USD ($) $ in Millions		12 Months Ended
		Feb. 28, 2020	Feb. 22, 2019	Feb. 23, 2018	May 24, 2019	May 25, 2018
Deferred Tax Assets, Gross [Abstract]
Employee benefit plan obligations			$ 59.2		$ 68.9
Foreign and domestic net operating loss carryforwards			46.1		39.1
Reserves and accruals			16.2		17.1
Tax credit carryforwards			38.7		19.1
Other, net			17.4		17.1
Deferred income tax assets, gross			177.6		225.5
Valuation Allowances			(7.8)		(5.7)
Valuation allowance provisions and adjustments	[1]	$ (1.3)	(1.3)	$ 0.4
Net deferred income tax assets			169.8		219.8
Deferred Tax Liabilities [Abstract]
Property, plant and equipment			29.4		28.6
Intangible assets			10.6		9.8
Deferred Tax Liabilities, Prepaid Expenses			2.2		2.2
Deferred income tax liabilities			42.2		102.0
Balance Sheet Related Disclosures [Abstract]
Net deferred income taxes		$ 124.6	135.8		117.8	$ 127.6
Deferred income tax assets - non-current			135.8		124.6
Deferred income tax liabilities - non-current			8.2		6.8
Current Taxes Payable or Refundable [Abstract]
Income taxes receivable			11.6		8.0
Income Taxes Receivable, Noncurrent			0.0		7.8
Income taxes payable			$ 3.5		13.9
Foreign locations [Member]
Deferred Tax Assets, Gross [Abstract]
Valuation Allowances					$ (3.7)

[1] The valuation allowance provisions were based on current year activity, and the valuation allowance adjustments, including a reversal of valuation allowance at an affiliate in the U.K., were based on various factors, which are further detailed below.