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 (accumulated deficit)	Adoption of new accounting standards, net of tax	Adoption of new accounting standards, net of tax Accumulated other comprehensive income (loss)	Adoption of new accounting standards, net of tax Retained earnings (accumulated deficit)
Beginning balance (in shares) at Feb. 23, 2019		579,443,146		3,671,621
Beginning balance at Feb. 23, 2019	$ 1,450.7	$ 5.8	$ 1,811.2	$ (25.8)	$ 91.3	$ (431.8)	$ 574.6	$ 16.6	$ 558.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	11.1		11.1
Shares issued and employee tax withholding on vesting of restricted stock	(12.1)		(12.1)
Net income	49.0					49.0
Other comprehensive income (loss), net of tax	(18.5)				(18.5)
Other activity	(0.4)		(0.1)			(0.3)
Ending balance (in shares) at Jun. 15, 2019		579,443,146		3,671,621
Ending balance at Jun. 15, 2019	2,054.4	$ 5.8	1,810.1	$ (25.8)	89.4	174.9
Beginning balance (in shares) at Feb. 23, 2019		579,443,146		3,671,621
Beginning balance at Feb. 23, 2019	1,450.7	$ 5.8	1,811.2	$ (25.8)	91.3	(431.8)	$ 574.6	$ 16.6	$ 558.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	343.8
Ending balance (in shares) at Sep. 07, 2019		579,443,146		3,671,621
Ending balance at Sep. 07, 2019	2,345.5	$ 5.8	1,815.7	$ (25.8)	80.1	469.7
Beginning balance (in shares) at Jun. 15, 2019		579,443,146		3,671,621
Beginning balance at Jun. 15, 2019	2,054.4	$ 5.8	1,810.1	$ (25.8)	89.4	174.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	6.5		6.5
Shares issued and employee tax withholding on vesting of restricted stock	(0.9)		(0.9)
Net income	294.8					294.8
Other comprehensive income (loss), net of tax	(9.3)				(9.3)
Ending balance (in shares) at Sep. 07, 2019		579,443,146		3,671,621
Ending balance at Sep. 07, 2019	2,345.5	$ 5.8	1,815.7	$ (25.8)	80.1	469.7
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
Issuance of common stock to Company's parents	0.0
Equity-based compensation	19.0		19.0
Shares issued and employee tax withholding on vesting of restricted stock	(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 (loss), 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 (in shares)	22,101
Shares issued and employee tax withholding on vesting of restricted stock	$ (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 (loss), net of tax	10.4				10.4
Other activity	(0.1)		(0.1)			0.0
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