Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Feb. 22, 2019	Feb. 23, 2018
Accounts receivable, allowances	$ 8.7	$ 11.1
Property, plant and equipment, accumulated depreciation	(1,009.3)	(998.1)
Other intangible assets, accumulated amortization	$ 55.8	$ 44.6
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares outstanding	116,800,000	116,200,000
Class A Common Stock [Member]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	475,000,000	475,000,000
Common stock, shares issued	87,594,913	85,728,770
Common stock, shares outstanding	87,594,913	85,728,770
Class B Common Stock [Member]
Common stock, par value		$ 0
Common stock, shares authorized	475,000,000	475,000,000
Common stock, shares issued	29,171,697	30,428,673
Common stock, shares outstanding	29,171,697	30,428,673