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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2025
Income Taxes |
Reconciliation between U.S. corporate income tax rate and effective income tax rate from continuing operations (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended June 30, | ​ | For the six months ended June 30, | ​
​ |  | 2025 |  | 2024 | ​ | 2025 |  | 2024 | ​
​ | ​ | ($ in millions) | ​
Income before income taxes | ​ | $ | 503.1 | ​ | $ | 443.9 | ​ | $ | 532.0 | ​ | $ | 1,071.0 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected tax at the U.S. statutory rate | ​ | $ | 105.6 |  | $ | 93.2 | ​ | $ | 111.7 |  | $ | 224.9 | ​
Tax credits | ​ | ​ | (22.6) | ​ | ​ | (18.7) | ​ | ​ | (52.2) | ​ | ​ | (34.9) | ​
Dividends received deduction | ​ | ​ | (19.8) | ​ | ​ | (18.3) | ​ | ​ | (38.0) | ​ | ​ | (37.7) | ​
Interest exclusion from taxable income | ​ | ​ | (5.7) | ​ | ​ | (6.1) | ​ | ​ | (10.9) | ​ | ​ | (11.9) | ​
Impact of equity method presentation | ​ | ​ | (5.1) | ​ | ​ | (6.4) | ​ | ​ | (10.8) | ​ | ​ | (11.1) | ​
Impact of noncontrolling interest presentation | ​ | ​ | (5.7) | ​ | ​ | (0.8) | ​ | ​ | (8.8) | ​ | ​ | (0.7) | ​
Changes in unrecognized tax benefits – Tax Cuts and Jobs Act of 2017 rate change | ​ | ​ | (5.4) | ​ | ​ | — | ​ | ​ | (5.4) | ​ | ​ | — | ​
Low income housing tax credit amortization | ​ | ​ | 12.2 | ​ | ​ | 10.4 | ​ | ​ | 24.4 | ​ | ​ | 21.0 | ​
Foreign country statutory rate differential | ​ | ​ | 3.4 | ​ | ​ | (0.8) | ​ | ​ | 13.0 | ​ | ​ | (3.2) | ​
State income taxes | ​ | ​ | 9.8 | ​ | ​ | 17.4 | ​ | ​ | 11.7 | ​ | ​ | 22.1 | ​
Valuation allowance | ​ | ​ | 0.7 | ​ | ​ | 13.9 | ​ | ​ | 1.3 | ​ | ​ | 15.4 | ​
Other | ​ | ​ | 2.2 | ​ | ​ | 3.3 | ​ | ​ | (0.4) | ​ | ​ | (1.7) | ​
Income taxes | ​ | $ | 69.6 | ​ | $ | 87.1 | ​ | $ | 35.6 | ​ | $ | 182.2 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 14.0 | % | ​ | 20.0 | % | ​ | 7.0 | % | ​ | 17.0 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -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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