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Income Taxes Deferred Income Taxes, Income Taxes Receivable, Income Taxes Payable (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 24, 2017
Feb. 26, 2016
Feb. 27, 2015
Deferred Tax Assets, Gross [Abstract]      
Employee benefit plan obligations $ 108.8 $ 114.4  
Foreign and domestic net operating loss carryforwards 57.0 69.7  
Reserves and accruals 29.8 29.1  
Tax credit carryforwards 17.4 28.2  
Other, net 21.2 18.9  
Deferred income tax assets, gross 234.2 260.3  
Deferred Tax Assets Valuation Allowance, change due to currency fluctuations   0.5  
Valuation Allowances (7.9) (10.6)  
Valuation Allowance, Deferred Tax Assets, Reversal of Valuation Allowances, Amount 56.0    
Valuation Allowance, Deferred Tax Asset, Change in Amount 2.7    
Valuation Allowance, Deferred Tax Asset, Other adjustments and expirations, Amount 2.2    
Valuation allowance provisions and adjustments [1] (2.2) (59.9) $ 6.1
Net deferred income tax assets 226.3 249.7  
Deferred Tax Assets Valuation Allowance, change due to currency fluctuations   0.5  
Deferred Tax Liabilities [Abstract]      
Property, plant and equipment 40.9 36.4  
Intangible assets 3.6 2.7  
Deferred Tax Liabilities, Prepaid Expenses 3.1 0.0  
Deferred income tax liabilities 47.6 39.1  
Balance Sheet Related Disclosures [Abstract]      
Net deferred income taxes 178.7 210.6  
Deferred income tax assets - non-current 179.6 211.6  
Deferred income tax liabilities - non-current (0.9) (1.0)  
Unremitted Foreign Earnings [Abstract]      
Unremitted foreign earnings permanently invested 121.0    
Estimated tax expense of unremitted foreign earnings 13.5    
Current Taxes Payable or Refundable [Abstract]      
Income taxes receivable 19.0 5.5  
Income Taxes Receivable, Noncurrent 18.5 0.0  
Income taxes payable 6.4 $ 5.2  
Foreign locations [Member]      
Deferred Tax Assets, Gross [Abstract]      
Valuation Allowances $ (7.5)    
[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.