Income Taxes Deferred Income Taxes, Income Taxes Receivable, Income Taxes Payable (Details) - USD ($) $ in Millions		12 Months Ended
		Feb. 22, 2019	Feb. 23, 2018	Feb. 24, 2017
income tax expense increase/decrease due to rate change		$ 27.9
Deferred Tax Assets, Gross [Abstract]
Employee benefit plan obligations		59.2	$ 55.8
Foreign and domestic net operating loss carryforwards		46.1	55.8
Reserves and accruals		16.2	18.9
Tax credit carryforwards		38.7	31.8
Other, net		17.4	16.1
Deferred income tax assets, gross		177.6	178.4
Valuation Allowances		(7.8)	(9.5)
Valuation Allowance, Deferred Tax Assets, Reversal of Valuation Allowances, Amount		1.7
Valuation allowance provisions and adjustments	[1]	(1.3)	0.4	$ (2.2)
Net deferred income tax assets		169.8	168.9
Deferred Tax Liabilities [Abstract]
Property, plant and equipment		29.4	28.4
Intangible assets		10.6	3.4
Deferred Tax Liabilities, Prepaid Expenses		2.2	1.7
Deferred income tax liabilities		42.2	33.5
Balance Sheet Related Disclosures [Abstract]
Net deferred income taxes		127.6	135.4
Deferred income tax assets - non-current		135.8	135.4
Deferred income tax liabilities - non-current		8.2	0.0
Other Tax Expense (Benefit)		1.6
Current Taxes Payable or Refundable [Abstract]
Income taxes receivable		11.6	19.7
Income Taxes Receivable, Noncurrent		0.0	0.0
Income taxes payable		3.5	$ 8.6
Foreign locations [Member]
Deferred Tax Assets, Gross [Abstract]
Valuation Allowances		$ (5.8)

[1] The valuation allowance provisions were based on current year activity, and the valuation allowance adjustments were based on various factors, which are further detailed below.