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Income Taxes Income Tax Contingencies (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 23, 2018
Feb. 24, 2017
Feb. 26, 2016
Liability for Uncertain Tax Positions [Abstract]      
Liability for uncertain tax positions, noncurrent $ 0.0 $ 0.2  
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits, beginning of period 2.8 8.6 $ 8.8
Gross decreases - tax positions in prior period (1.0) (5.3) 0.0
Lapse of statute of limitations 0.4 (0.5) (0.2)
Unrecognized tax benefits, end of period $ 2.2 $ 2.8 $ 8.6