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Income Taxes Income Tax Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 23, 2018
Feb. 24, 2017
Feb. 26, 2016
Valuation Allowance, Deferred Tax Assets, Reversal of Valuation Allowances, Amount $ 23.9    
U.S. federal statutory tax rate 32.90% 35.00%  
Tax expense at the U.S. federal statutory rate $ 53.2 $ 68.7 $ 61.2
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 27.9 0.0 0.0
Foreign investment tax credits [1] (1.6) 0.0 (1.5)
Valuation allowance provisions and adjustments [2] 0.4 (2.2) (59.9)
COLI income [3] (3.4) (3.3) (0.7)
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount [4] 1.4 (2.0) (1.6)
State and local income taxes, net of federal 6.7 6.5 6.7
Foreign operations, less applicable foreign tax credits [5] 4.0 9.3 (0.1)
Research tax credit (2.3) (1.8) (1.9)
Tax reserve adjustments (0.2) (5.3) 0.0
Other (5.3) 1.8 2.3
Income tax expense $ 80.8 71.7 4.5
FRANCE      
Valuation Allowance, Deferred Tax Assets, Reversal of Valuation Allowances, Amount     $ 56.0
income tax expense increase/decrease due to rate change   7.9  
UNITED KINGDOM      
income tax expense increase/decrease due to rate change   $ 1.5  
[1] Investment tax credits were granted by the Czech Republic for investments in qualifying manufacturing equipment.
[2] 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.
[3] The increase in the cash surrender value of COLI policies, net of normal insurance expenses, plus death benefit gains are non-taxable
[4] The foreign operations, less applicable foreign tax credits, amounts include the rate differential between local statutory rates and the U.S. rate on foreign operations.
[5] Reductions to the French corporate tax rate resulted in the revaluation of certain deferred tax assets of our French tax group, causing increases to income tax expense of $4.0 and $7.9 in 2018 and 2017, respectively. During 2017, reductions to the United Kingdom corporate tax rate increased tax expense by $1.5.