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Income Taxes (Tables) | 12 Months Ended
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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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