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Accumulated Other Comprehensive Income (Loss) (AOCI) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), net of tax, Beginning Balance | $ (868.9) |  |
Tax effect | (64.1) | $ 248.3 | $ 42.0
Accumulated other comprehensive income (loss), net of tax, Ending Balance | (655.8) | (868.9) |
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 | (751.6) | 29.3 | 171.8
Change in unrealized gains (losses) on debt securities | 262.3 | (1,044.9) | (188.6)
Change in unrealized gains (losses) on debt securities for which credit-related portion was recognized in earnings |  |  | (0.4)
Tax effect | (64.3) | 264.0 | 46.5
Accumulated other comprehensive income (loss), debt securities, available-for-sale, adjustment, after tax, Ending Balance | (553.6) | (751.6) | 29.3
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 | (82.1) | (39.9) | (38.0)
Change in foreign currency translation adjustment | 17.7 | (43.3) | (1.9)
Tax effect | (0.5) | 1.1 | 0.0
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Ending Balance | (64.9) | (82.1) | (39.9)
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 | (35.2) | (81.8) | (94.2)
Net actuarial (loss) gain | (4.8) | 57.4 | 11.4
Amortization of net actuarial loss | 2.0 | 5.8 | 6.8
Amortization of prior service cost (credit) |  | 0.2 | (1.3)
Tax effect | 0.7 | (16.8) | (4.5)
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Ending Balance | (37.3) | (35.2) | (81.8)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), net of tax, Beginning Balance | (868.9) | (92.4) | 39.6
Change in unrealized gains (losses) on debt securities | 262.3 | (1,044.9) | (188.6)
Change in unrealized gains (losses) on debt securities for which credit-related portion was recognized in earnings |  |  | (0.4)
Change in foreign currency translation adjustment | 17.7 | (43.3) | (1.9)
Net actuarial (loss) gain | (4.8) | 57.4 | 11.4
Amortization of net actuarial loss | 2.0 | 5.8 | 6.8
Amortization of prior service cost (credit) |  | 0.2 | (1.3)
Tax effect | (64.1) | 248.3 | 42.0
Accumulated other comprehensive income (loss), net of tax, Ending Balance | $ (655.8) | $ (868.9) | $ (92.4)

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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, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 5A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482736/825-10-45-5A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -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 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 2: 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 3: 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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