Capital Structure Capital Structure (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Feb. 22, 2019	Feb. 23, 2018	Feb. 24, 2017
Class of Stock [Line Items]
Common stock repurchases	$ 4.2	$ 33.8	$ 48.4
Conversion of Stock, Shares Converted	1.3	0.9
Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock repurchases, shares	0.3	2.4
Common stock repurchases	$ 4.2	$ 33.8
Class B Common Stock [Member]
Class of Stock [Line Items]
Common stock repurchases, shares	0.0	0.0
Common stock repurchases	$ 0.0	$ 0.0