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Accumulated Other Comprehensive Income (Loss) (AOCI) (Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive income (loss), net of tax, Beginning Balance |  |  | $ (655.8) |
Change in unrealized losses on debt securities |  |  | 496.3 |
Change in foreign currency translation adjustment |  |  | (4.0) |
Amortization of net actuarial loss |  |  | 1.7 |
Tax effect | $ (146.9) | $ 57.2 | (128.7) | $ 45.9
Accumulated other comprehensive income (loss), net of tax, Ending Balance | (290.5) |  | (290.5) |
Unrealized Gains (Losses) on Debt Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive income (loss), debt securities, available-for-sale, adjustment, after tax, Beginning Balance |  |  | (553.6) |
Change in unrealized losses on debt securities |  |  | 496.3 |
Tax effect | (146.4) | 56.9 | (128.5) | 46.3
Accumulated other comprehensive income (loss), debt securities, available-for-sale, adjustment, after tax, Ending Balance | (185.8) |  | (185.8) |
Foreign Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Beginning Balance |  |  | (64.9) |
Change in foreign currency translation adjustment |  |  | (4.0) |
Tax effect | (0.4) | $ 0.3 | 0.2 | $ 0.0
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Ending Balance | (68.7) |  | (68.7) |
Pension Benefit Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Beginning Balance |  |  | (37.3) |
Amortization of net actuarial loss |  |  | 1.7 |
Tax effect |  |  | (0.4) |
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Ending Balance | $ (36.0) |  | $ (36.0) |

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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14 + Details
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- Definition Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 + Details
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