Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Class A Common Stock	Additional paid in capital	Treasury Stock	Accumulated other comprehensive income loss	Retained earnings
Beginning balance (in shares) at Feb. 29, 2020		582,997,251		(3,671,621)
Beginning balance at Feb. 29, 2020	$ 2,278.1	$ 5.8	$ 1,824.3	$ (25.8)	$ (118.5)	$ 592.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock to Company's parents (in shares)		1,312,859
Equity-based compensation	19.0		19.0
Shares issued and employee tax withholding on vesting of restricted stock units	(6.2)		(6.2)
Repurchase of common stock (in shares)				101,611,736
Repurchase of common stock	(1,680.0)			$ (1,680.0)
Dividends accrued on convertible preferred stock	(3.9)					(3.9)
Net income	586.2					586.2
Other comprehensive income, net of tax	1.7				1.7
Ending balance (in shares) at Jun. 20, 2020		584,310,110		(105,283,357)
Ending balance at Jun. 20, 2020	1,194.9	$ 5.8	1,837.1	$ (1,705.8)	(116.8)	1,174.6
Beginning balance (in shares) at Feb. 29, 2020		582,997,251		(3,671,621)
Beginning balance at Feb. 29, 2020	2,278.1	$ 5.8	1,824.3	$ (25.8)	(118.5)	592.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	870.7
Ending balance (in shares) at Sep. 12, 2020		584,332,211		(105,283,357)
Ending balance at Sep. 12, 2020	1,501.6	$ 5.8	1,875.8	$ (1,705.8)	(106.4)	1,432.2
Beginning balance (in shares) at Jun. 20, 2020		584,310,110		(105,283,357)
Beginning balance at Jun. 20, 2020	1,194.9	$ 5.8	1,837.1	$ (1,705.8)	(116.8)	1,174.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	9.3		9.3
Shares issued and employee tax withholding on vesting of restricted stock units (in shares)		22,101
Shares issued and employee tax withholding on vesting of restricted stock units	(0.5)		(0.5)
Equity reclassification	30.0		30.0
Dividends accrued on convertible preferred stock	(26.9)					(26.9)
Net income	284.5					284.5
Other comprehensive income, net of tax	10.4				10.4
Other activity	(0.1)		(0.1)
Ending balance (in shares) at Sep. 12, 2020		584,332,211		(105,283,357)
Ending balance at Sep. 12, 2020	1,501.6	$ 5.8	1,875.8	$ (1,705.8)	(106.4)	1,432.2
Beginning balance (in shares) at Feb. 27, 2021		585,574,666		(120,009,647)
Beginning balance at Feb. 27, 2021	1,324.3	$ 5.9	1,898.9	$ (1,907.0)	63.5	1,263.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	22.2		22.2
Shares issued and employee tax withholding on vesting of restricted stock units (in shares)		945,942
Shares issued and employee tax withholding on vesting of restricted stock units	(10.0)		(10.0)
Cash dividends declared on common stock	(46.5)					(46.5)
Dividends accrued on convertible preferred stock	(36.4)					(36.4)
Net income	444.8					444.8
Other comprehensive income, net of tax	0.1				0.1
Other activity	(0.1)		0.0			(0.1)
Ending balance (in shares) at Jun. 19, 2021		586,520,608		(120,009,647)
Ending balance at Jun. 19, 2021	1,698.4	$ 5.9	1,911.1	$ (1,907.0)	63.6	1,624.8
Beginning balance (in shares) at Feb. 27, 2021		585,574,666		(120,009,647)
Beginning balance at Feb. 27, 2021	1,324.3	$ 5.9	1,898.9	$ (1,907.0)	63.5	1,263.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	740.0
Ending balance (in shares) at Sep. 11, 2021		586,668,103		(120,009,647)
Ending balance at Sep. 11, 2021	1,959.9	$ 5.9	1,936.1	$ (1,907.0)	78.7	1,846.2
Beginning balance (in shares) at Jun. 19, 2021		586,520,608		(120,009,647)
Beginning balance at Jun. 19, 2021	1,698.4	$ 5.9	1,911.1	$ (1,907.0)	63.6	1,624.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	26.8		26.8
Shares issued and employee tax withholding on vesting of restricted stock units (in shares)		147,495
Shares issued and employee tax withholding on vesting of restricted stock units	(1.8)		(1.8)
Cash dividends declared on common stock	(46.5)					(46.5)
Dividends accrued on convertible preferred stock	(27.3)					(27.3)
Net income	295.2					295.2
Other comprehensive income, net of tax	15.1				15.1
Ending balance (in shares) at Sep. 11, 2021		586,668,103		(120,009,647)
Ending balance at Sep. 11, 2021	$ 1,959.9	$ 5.9	$ 1,936.1	$ (1,907.0)	$ 78.7	$ 1,846.2