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Income Taxes Deferred Income Taxes, Income Taxes Receivable, Income Taxes Payable (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 23, 2018
Feb. 24, 2017
Feb. 26, 2016
Deferred Tax Assets, Gross [Abstract]      
Employee benefit plan obligations $ 55.8 $ 108.8  
Foreign and domestic net operating loss carryforwards 55.8 57.0  
Reserves and accruals 18.9 29.8  
Tax credit carryforwards 31.8 17.4  
Other, net 16.1 21.2  
Deferred income tax assets, gross 178.4 234.2  
Valuation Allowances (9.5) (7.9)  
Valuation Allowance, Deferred Tax Assets, Reversal of Valuation Allowances, Amount 23.9    
Valuation allowance provisions and adjustments [1] 0.4 (2.2) $ (59.9)
Net deferred income tax assets 168.9 226.3  
Deferred Tax Liabilities [Abstract]      
Property, plant and equipment 28.4 40.9  
Intangible assets 3.4 3.6  
Deferred Tax Liabilities, Prepaid Expenses 1.7 3.1  
Deferred income tax liabilities 33.5 47.6  
Balance Sheet Related Disclosures [Abstract]      
Net deferred income taxes 135.4 178.7  
Deferred income tax assets - non-current 135.4 179.6  
Deferred income tax liabilities - non-current 0.0 (0.9)  
Unremitted Foreign Earnings [Abstract]      
Undistributed Earnings of Foreign Subsidiaries 76.2    
Current Taxes Payable or Refundable [Abstract]      
Income taxes receivable 19.7 19.0  
Income Taxes Receivable, Noncurrent 0.0 18.5  
Income taxes payable 8.6 $ 6.4  
Foreign locations [Member]      
Deferred Tax Assets, Gross [Abstract]      
Valuation Allowances $ (9.0)    
[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.