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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
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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%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.1.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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