Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Class A Common Stock	Additional paid in capital	Treasury Stock	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjustment	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding, ending balance (in shares)			579,443,146		0
Shares outstanding, beginning balance (in shares) at Feb. 24, 2018			579,443,146		0
Beginning AOCI balance at Feb. 24, 2018	$ 1,398.2		$ 5.8	$ 1,770.3	$ 0.0	$ 191.1		$ (569.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	47.7			47.7
Employee tax withholding on vesting of phantom units	(15.3)			(15.3)
Repurchase of common stock (in shares)					3,671,621
Repurchase of common stock	(25.8)				$ (25.8)
Reorganization transactions	13.1			13.1
Net income	131.1							131.1
Other comprehensive income (loss), net of tax	(99.8)					(99.8)
Other activity	1.5			(4.6)				6.1
Shares outstanding, ending balance (in shares)			579,443,146		0
Ending AOCI balance at Feb. 23, 2019	1,450.7	$ 574.6	$ 5.8	1,811.2	$ (25.8)	91.3	$ 16.6	(431.8)	$ 558.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding, ending balance (in shares)			579,443,146		(3,671,621)
Shares outstanding, beginning balance (in shares) at Feb. 23, 2019			579,443,146		(3,671,621)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock to Company's parents (in shares)			3,554,105
Equity-based compensation	32.8			32.8
Employee tax withholding on vesting of phantom units	(18.8)			(18.8)
Net income	466.4							466.4
Other comprehensive income (loss), net of tax	(226.4)					(226.4)
Other activity	(1.2)			(0.9)				(0.3)
Shares outstanding, ending balance (in shares)			579,443,146		(3,671,621)
Ending AOCI 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]
Shares outstanding, ending balance (in shares)			582,997,251		(3,671,621)
Shares outstanding, beginning balance (in shares) at Feb. 29, 2020			582,997,251		(3,671,621)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock to Company's parents (in shares)			1,312,859
Equity-based compensation	59.0			59.0
Shares issued and employee tax withholding on vesting of phantom units and restricted stock (in shares)			1,264,556
Shares issued and employee tax withholding on vesting of phantom units and restricted stock	(14.0)		$ 0.1	(14.1)
Equity reclassification	30.0			30.0
Repurchase of common stock (in shares)					116,338,026
Repurchase of common stock	(1,881.2)				$ (1,881.2)
Dividends declared on common stock	(93.7)							(93.7)
Dividends accrued on convertible preferred stock	(86.0)							(86.0)
Net income	850.2							850.2
Other comprehensive income (loss), net of tax	182.0					182.0
Other activity	(0.1)			(0.3)				0.2
Shares outstanding, ending balance (in shares)			582,997,251		(3,671,621)
Ending AOCI 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]
Shares outstanding, ending balance (in shares)			585,574,666		(120,009,647)