Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Aug. 27, 2021	Aug. 28, 2020	Aug. 27, 2021	Aug. 28, 2020	May 28, 2021	Feb. 26, 2021	May 29, 2020	Feb. 28, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 24.7	$ 55.5	$ (3.4)	$ 17.4
Adjustment for earnings attributable to participating securities	(0.6)	$ (1.3)	$ 0.1	(0.4)
Net income used in calculating earnings per share	$ 24.1			$ (3.3)
Weighted-average common shares outstanding including participating securities (in millions)	118,000,000.0	117,600,000	118,100,000	117,400,000
Adjustment for participating securities (in millions)	(3,100,000)	(2,800,000)	(2,900,000)	(2,400,000)
Shares used in calculating basic earnings per share (in millions)				115,200,000
Shares used in calculating diluted earnings per share (in millions)				115,200,000
Earnings per share, basic	$ 0.21	$ 0.47	$ (0.03)	$ 0.15
Earnings per share, diluted	$ 0.21	$ 0.47	$ (0.03)	$ 0.15
Common Stock, Shares, Outstanding	113,821,358	114,776,546	113,821,358	114,776,546	115,664,399	114,908,676	114,759,549	117,202,000
Anti-dilutive performance units excluded from computation of diluted earnings per share (in millions)			500,000