Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions		Total	Interest Rate Swaps [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Interest Rate Swaps [Member]	Retained Earnings [Member]
Balance Beginning at Jun. 27, 2020		$ 2,010.6		$ 1.3	$ 1,703.0	$ (10.3)		$ 316.6
Balance Beginning, shares at Jun. 27, 2020				131,300,000
Net income (loss)		9.3						9.3
Interest rate swaps		4.1	$ 4.1				$ 4.1
Issuance of common stock under stock-based compensation plans, shares				600,000
Issuance of common stock under employee stock purchase plan		16.3			16.3
Issuance of common stock under employee stock purchase plan, shares				400,000
Stock-based compensation expense		17.4			17.4
Balance Ending at Mar. 27, 2021		2,057.7		$ 1.3	1,736.7	(6.2)		325.9
Balance Ending, shares at Mar. 27, 2021				132,300,000
Balance Beginning at Dec. 26, 2020		2,046.9		$ 1.3	1,721.1	(9.0)		333.5
Balance Beginning, shares at Dec. 26, 2020				132,000,000.0
Net income (loss)		(7.6)						(7.6)
Interest rate swaps		2.8	2.8				2.8
Issuance of common stock under stock-based compensation plans		1.0			1.0
Issuance of common stock under stock-based compensation plans, shares				200,000
Issuance of common stock under employee stock purchase plan		8.5			8.5
Issuance of common stock under employee stock purchase plan, shares				100,000
Stock-based compensation expense		6.1			6.1
Balance Ending at Mar. 27, 2021		2,057.7		$ 1.3	1,736.7	(6.2)		325.9
Balance Ending, shares at Mar. 27, 2021				132,300,000
Balance Beginning at Jul. 03, 2021		$ 2,106.1		$ 1.3	1,752.8	(5.3)		357.3
Balance Beginning, shares at Jul. 03, 2021		132,500,000		132,500,000
Net income (loss)		$ 36.5						36.5
Interest rate swaps		17.4	17.0				17.0
Foreign currency translation adjustment		0.4				0.4
Issuance of common stock under stock-based compensation plans		(8.0)			(8.0)
Issuance of common stock under stock-based compensation plans, shares				600,000
Issuance of common stock under employee stock purchase plan		12.3			12.3
Issuance of common stock under employee stock purchase plan, shares				300,000
Conversion of Core-Mark shares of common stock		998.8		$ 0.2	998.6
Conversion of Core-Mark shares of common stock, shares				19,900,000
Conversion of Core-Mark stock-based compensation	[1]	9.2			9.2
Stock-based compensation expense		32.2			32.2
Balance Ending at Apr. 02, 2022		$ 3,204.5		$ 1.5	2,797.1	12.1		393.8
Balance Ending, shares at Apr. 02, 2022		153,300,000		153,300,000
Balance Beginning at Jan. 01, 2022		$ 3,160.9		$ 1.5	2,788.5	0.5		370.4
Balance Beginning, shares at Jan. 01, 2022				153,300,000
Net income (loss)		23.4						23.4
Interest rate swaps		11.6	$ 11.2				$ 11.2
Foreign currency translation adjustment		0.4				0.4
Issuance of common stock under stock-based compensation plans		(1.2)			(1.2)
Stock-based compensation expense		9.8			9.8
Balance Ending at Apr. 02, 2022		$ 3,204.5		$ 1.5	$ 2,797.1	$ 12.1		$ 393.8
Balance Ending, shares at Apr. 02, 2022		153,300,000		153,300,000

[1] Represents the portion of replacement stock-based compensation awards that relates to pre-combination vesting.