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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Aug. 23, 2019
Aug. 24, 2018
Aug. 23, 2019
Aug. 24, 2018
May 24, 2019
Feb. 22, 2019
Feb. 23, 2018
May 26, 2017
Earnings Per Share [Abstract]                
Net income $ 60.5 $ 49.1 $ 78.3 $ 66.1        
Adjustment for earnings attributable to participating securities (1.3) (1.0) (1.5) (1.3)        
Net income used in calculating earnings per share $ 59.2 $ 48.1 $ 76.8 $ 64.8        
Weighted-average common shares outstanding including participating securities (in millions) 119,700,000 119,200,000 119,600,000 119,000,000.0        
Adjustment for participating securities (in millions) (2,400,000) (2,500,000) (2,300,000) (2,300,000)        
Shares used in calculating basic earnings per share (in millions) 117,300,000 116,700,000 117,300,000 116,700,000        
Effect of dilutive stock-based compensation (in millions) 500,000 0 500,000 0        
Shares used in calculating diluted earnings per share (in millions) 117,800,000 116,700,000 117,800,000 116,700,000        
Earnings per share, basic $ 0.50 $ 0.41 $ 0.65 $ 0.56        
Earnings per share, diluted $ 0.50 $ 0.41 $ 0.65 $ 0.56        
Common Stock, Shares, Outstanding 117,243,960 116,683,614 117,243,960 116,683,614 117,313,755 116,766,610 116,157,443 116,680,035
Anti-dilutive performance units excluded from computation of diluted earnings per share (in millions) 0 500,000 0 500,000