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Income Taxes - Reconciliation of Provision for Income Taxes with Federal Statutory Income Tax Rate (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Federal statutory rate $ 393.7 $ 248.9 $ 278.7
State income taxes - net of federal benefit 61.0 49.7 32.9
Differences related to non U.S. operations (13.8) (20.6) (31.9)
Alternative energy and other tax credits (8.9) (7.9) (6.9)
Other permanent differences 42.6 27.6 22.5
Stock-based compensation (88.9) (76.1) (59.3)
Changes in unrecognized tax benefits 7.4 11.9 4.0
Change in valuation allowance 10.0 3.9 15.5
Change in U.S. and U.K. tax rates 1.3 (18.3) (44.5)
Total provision for income taxes $ 404.4 $ 219.1 $ 211.0
Federal statutory rate, % of Pretax Earnings 21.00% 21.00% 21.00%
State income taxes-net of Federal benefit, % of Pretax Earnings 3.30% 4.20% 2.50%
Differences related to non U.S. operations, % of Pretax Earnings (0.70%) (1.70%) (2.40%)
Alternative energy and other tax credits, % of Pretax Earnings (0.50%) (0.70%) (0.50%)
Other permanent differences, % of Pretax Earnings 2.30% 2.30% 1.70%
Stock-based compensation (4.70%) (6.40%) (4.50%)
Changes in unrecognized tax benefits, % of Pretax Earnings 0.40% 1.00% 0.30%
Change in valuation allowance, % of Pretax Earnings 0.50% 0.30% 1.20%
Change in U.S. and U.K. tax rates 0.00% (1.50%) (3.40%)
Total provision for income taxes, % of Pretax Earnings 21.60% 18.50% 15.90%