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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

Income Before Income Taxes

Income before income taxes were derived from the following sources:

			2024						2023						2022
Domestic			$	1,390.6					1,392.7						1,335.7
Foreign			117.5						129.3						104.3
Income before income taxes			$	1,508.1					1,522.0						1,440.0

Components of Income Tax Expense (Benefit)

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

			2024																		2023																		2022
			Current						Deferred						Total						Current						Deferred						Total						Current						Deferred						Total
Federal			$	265.6					(3.0)						262.6						273.3						(9.2)						264.1						267.6						(5.0)						262.6
State			56.1						(0.1)						56.0						59.6						(1.3)						58.3						58.0						(1.1)						56.9
Foreign			39.6						(0.7)						38.9						44.9						(0.3)						44.6						35.0						(1.4)						33.6
Income tax expense			$	361.3					(3.8)						357.5						377.8						(10.8)						367.0						360.6						(7.5)						353.1

Difference In Income Tax Expense And Expected Expense

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

			2024												2023												2022
			Amount						Percent						Amount						Percent						Amount						Percent
United States federal statutory income tax			$	316.7					21.0		%				$	319.6					21.0		%				$	302.4					21.0		%
State income taxes, net of federal benefit			43.3						2.9		%				45.1						3.0		%				45.6						3.2		%
Other, net			(2.5)						-0.2		%				2.3						0.1		%				5.1						0.3		%
Effective income tax rate			$	357.5					23.7		%				$	367.0					24.1		%				$	353.1					24.5		%

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: 

			2024						2023
Deferred income tax assets:
Inventory costing and valuation methods			$	5.9					5.6
Insurance reserves			5.5						8.3
Foreign net operating loss and credit carryforwards			2.4						3.0
Stock-based compensation			3.7						3.8
Operating lease liabilities			72.2						69.5
Section 174 capitalization			11.1						7.4
Other, deferred tax assets			8.3						9.4
Total deferred income tax assets			109.1						107.0
Less: Valuation allowances			(1.8)						(2.2)
Total net deferred income tax assets			107.3						104.8
Deferred income tax liabilities:
Property and equipment			(90.9)						(95.4)
Operating lease ROU assets			(70.6)						(68.3)
Prepaid expenses			(4.6)						(3.5)
Other, deferred tax liabilities			(0.2)						(0.4)
Total deferred income tax liabilities			(166.3)						(167.6)
Net deferred income tax liabilities			$	(59.0)					(62.8)

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:

			2024						2023
Balance at beginning of year:			$	10.2					10.1
Increase related to prior year tax positions			1.1						5.6
Increase related to current year tax positions			0.4						0.6
Decrease related to statute of limitation lapses			(1.8)						(6.1)
Balance at end of year:			$	9.9					10.2

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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