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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Pretax change before reclassifications |  | $ 144.6 | $ (494.8)
Reclassifications out of AOCI |  | 5.0 | 2.3
Tax effect |  | (36.6) | 124.3
Total other comprehensive income (loss), net of tax |  | 113.0 | (368.2)
Unrealized Gains (Losses) on Debt Securities |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Pretax change before reclassifications |  | 142.0 | (497.1)
Reclassifications out of AOCI |  | 4.5 | 0.7
Tax effect |  | (36.4) | 124.8
Total other comprehensive income (loss), net of tax |  | 110.1 | (371.6)
Foreign Currency Translation Adjustment |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Pretax change before reclassifications |  | 2.6 | 2.3
Reclassifications out of AOCI |  | 0.0 | 0.0
Tax effect |  | 0.0 | 0.0
Total other comprehensive income (loss), net of tax |  | 2.6 | 2.3
Pension Benefit Adjustment |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Pretax change before reclassifications |  | 0.0 | 0.0
Reclassifications out of AOCI | [1] | 0.5 | 1.6
Tax effect |  | (0.2) | (0.5)
Total other comprehensive income (loss), net of tax |  | $ 0.3 | $ 1.1
[1] | Amounts are components of net periodic cost. See Note 11 Employee Benefit Plans for additional details.

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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