Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Earnings Before Income Taxes

Earnings before income taxes were derived from the following sources:

	2022		2021	2020
Domestic	$	1,335.7	1,100.3	1,046.7
Foreign	104.3		107.5	86.0
Earnings before income taxes	$	1,440.0	1,207.8	1,132.7

Components of Income Tax Expense (Benefit)

Components of income tax expense (benefit) were as follows:

2022:	Current		Deferred	Total
Federal	$	267.6	(5.0)	262.6
State	58.0		(1.1)	56.9
Foreign	35.0		(1.4)	33.6
Income tax expense	$	360.6	(7.5)	353.1

2021:	Current		Deferred	Total
Federal	$	214.3	(11.4)	202.9
State	46.7		(1.7)	45.0
Foreign	34.1		0.8	34.9
Income tax expense	$	295.1	(12.3)	282.8

2020:	Current		Deferred	Total
Federal	$	195.4	1.8	197.2
State	47.5		(0.5)	47.0
Foreign	28.1		1.3	29.4
Income tax expense	$	271.0	2.6	273.6

Difference In Income Tax Expense And Expected Expense

Income tax expense in the accompanying consolidated financial statements differed from the expected expense as follows:

	2022			2021		2020
U.S. federal statutory income tax rate	21.0		%	21.0	%	21.0	%
U.S. federal income tax expense at statutory rate	$	302.4		253.6		237.9
Increase (decrease) attributed to:
State income taxes, net of federal benefit	45.6			34.9		36.3
Other, net	5.1			(5.7)		(0.6)
Total income tax expense	$	353.1		282.8		273.6
Effective income tax rate	24.5		%	23.4	%	24.2	%

Summary of Temporary Differences That Give Rise to Deferred Income Tax Assets And Liabilities

The tax effects of temporary differences that give rise to deferred income tax assets and liabilities at year end consisted of the following: 

	2022		2021 (1)
Deferred income tax assets (liabilities):
Inventory costing and valuation methods	$	6.7	5.2
Insurance reserves	8.6		7.4
Stock-based compensation	3.6		2.8
Operating lease liabilities	62.6		62.6
Foreign net operating loss and credit carryforwards	2.6		1.4
Foreign valuation allowances	(1.8)		(1.7)
Prepaid royalty	0.3		5.9
Section 174 capitalization	3.4		—
Other, deferred tax assets	9.3		10.8
Total deferred income tax assets	95.3		94.4
Property and equipment	(102.6)		(110.0)
Operating lease ROU assets	(61.5)		(61.3)
Other, deferred tax liabilities	(4.8)		(4.3)
Total deferred income tax liabilities	(168.9)		(175.6)
Deferred income tax liabilities	$	(73.6)	(81.2)

(1) The presentation of prior year deferred income tax assets and liabilities has been updated to conform to current period presentation.

Reconciliation of The Beginning and Ending Amount of Total Gross Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of total gross unrecognized tax benefits is as follows:

	2022		2021
Balance at beginning of year:	$	7.4	8.8
Increase related to prior year tax positions	3.5		0.3
Increase related to current year tax positions	0.6		0.9
Decrease related to statute of limitation lapses	(0.9)		(2.6)
Settlements	(0.5)		—
Balance at end of year:	$	10.1	7.4