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v3.25.4

Reconciliation of income tax computed at US Federal tax rates (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Income Tax [Abstract] |  |  |  |
U.S. Federal Statutory Income Tax Rate, Amount |  | $ 196.0 | $ 472.8 | $ 344.4
State and Local Income Taxes, net of Federal Income tax effect, Amount | [1] | 1.8 | (7.3) | (3.5)
Foreign Tax Effects, Amount |  | 0.1 | 2.8 | (2.0)
Effect of Cross-Border Tax Laws, Amount |  | 3.5 | (0.9) | 8.4
Tax Credits, Amount |  | (10.4) | (2.1) | (2.3)
Nondeductible Expense, Amount |  | (4.8) | (3.9) | (1.5)
Interest on Unrecognized Tax Benefits, Other Adjustments, Amount |  | 11.2 | 13.2 | 12.2
Other Adjustments, Amount |  | (2.4) | (2.4) | 0.6
Total Income Tax |  | $ 195.0 | $ 472.2 | $ 356.3
Statutory Income Tax, Rate |  | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, net of Federal Income tax effect, Percent |  | 0.20% | (0.30%) | (0.20%)
Foreign Tax Effects, Percent |  | 0.00% | 0.10% | (0.10%)
Effect of Cross-Border Tax Laws, Percent |  | 0.40% | 0.00% | 0.50%
Tax Credits, Percent |  | (1.10%) | (0.10%) | (0.10%)
Nondeductible Expense, Percent |  | (0.50%) | (0.20%) | (0.10%)
Interest on Unrecognized Tax Benefits, percent |  | 1.20% | 0.60% | 0.70%
Other Adjustments, Percent |  | (0.30%) | (0.10%) | 0.00%
Effective Tax Rate |  | 20.90% | 21.00% | 21.70%
[1] | State taxes in Minnesota, California, and New York made up the majority (greater than 50 percent) of the tax effect in this category for 2025. State taxes in Maine made up the majority (greater than 50 percent) of the tax effect in this category for 2024 and 2023.

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying statutory federal (national) tax rate to pretax income (loss) from continuing operation attributable to other reconciling item. Excludes state and local income tax expense (benefit), federal tax expense (benefit), statutory income tax expense (benefit) outside of country of domicile, tax credit, nondeductible expense, deduction, income tax settlement, income tax contingency, and cross-border tax law. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: 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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- 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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