XML 54 R39.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Investments - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) security | Mar. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) security | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Principal amount of bonds and certificates of deposit | $ 713,200,000 |  | $ 713,200,000 |  |
Securities exceeding 10% of Shareholders' Equity | 0 |  | 0 | $ 0 | $ 0
Non-income producing securities | $ 0 |  | $ 0 |  |
Debt securities, available-for-sale, unrealized loss position, number of positions downgraded | security | 10 |  | 10 |  |
Debt securities, available-for-sale, unrealized loss position, fair value, downgraded in period | $ 203,000,000 |  | $ 203,000,000 |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss, downgraded in period | 66,700,000 |  | 66,700,000 |  |
Debt securities, available-for-sale, allowance for credit loss, not previously recorded |  |  | 0 | 0 |
Debt securities, available-for-sale, allowance for credit loss | $ 0 |  | 0 | 0 | $ 0
Debt securities, available-for-sale, allowance for credit loss, write-off |  | $ 0 | $ 0 | $ 0 |
Recovery of impairment, other assets, number of positions | security |  |  | 3 |  |
Percent change in investment income | 51.00% |  | 49.00% |  |
Percent change in book yield | 26.00% |  | 26.00% |  |
debt securities, available-for-sale, unrealized loss position, issuers downgraded | security | 5 |  | 5 |  |

X
- Definition Number of issuers for investments in debt securities with a credit rating downgrade during the period. The securities issued by these issuers are measured at fair value with the changes in fair value recognized in other comprehensive income (available-for-sale), in an unrealized loss position, without an allowance for credit losses. + References No definition available. + Details
Name: | pgr_DebtSecuritiesAvailableForSaleUnrealizedLossPositionIssuersDowngraded
Namespace Prefix: | pgr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on debt securities with credit rating downgrades during the period. These securities are measured at fair value with changes in fair value recognized in other comprehensive income (available-for-sale), in an unrealized loss position, without a credit loss allowance. + References No definition available. + Details
Name: | pgr_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAccumulatedLossDowngradesinPeriod
Namespace Prefix: | pgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt securities with a credit rating downgrade during the period. These securities are measure at fair value with the changes in fair value recognized in other comprehensive income (available-for-sale), in an unrealized loss position without an allowance for credit losses. + References No definition available. + Details
Name: | pgr_DebtSecuritiesAvailableforsaleUnrealizedLossPositionDowngradedinPeriod
Namespace Prefix: | pgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investments in debt securities with a credit rating downgrade during the period. These securities are measured at fair value with the changes in fair value recognized in other comprehensive income (available-for-sale), in an unrealized loss position, without an allowance for credit losses. + References No definition available. + Details
Name: | pgr_DebtSecuritiesAvailableforsaleUnrealizedLossPositionPositionsDowngraded
Namespace Prefix: | pgr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of fixed-maturity securities that were non-income producing during the preceding 12 months. + References No definition available. + Details
Name: | pgr_NonIncomeProducingSecurities
Namespace Prefix: | pgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Change in the annualized weighted average book yield on securities held in the portfolio. Reflected as a percentage change compared to the same period in the prior year. + References No definition available. + Details
Name: | pgr_PercentChangeinBookYield
Namespace Prefix: | pgr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Current year increase (decrease) in investment income before expenses. Reflected as a percentage change compared to the same period in the prior year. + References No definition available. + Details
Name: | pgr_PercentChangeinInvestmentIncome
Namespace Prefix: | pgr_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of positions for which a portion of the prior impairment was recovered during the period as a result of litigation settlements. The original positions and impairments were recorded as part of other assets on the Balance Sheets + References No definition available. + Details
Name: | pgr_RecoveryOfImpairmentOtherAssetsNumberOfPositions
Namespace Prefix: | pgr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Securities held in the portfolio with a single issuer for which the aggregate cost or fair value exceeds 10% of shareholders' equity. Excludes U.S. Government Obligations. + References No definition available. + Details
Name: | pgr_SecuritiesExceeding10ofShareholdersEquity
Namespace Prefix: | pgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance for credit 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/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of writeoff of allowance for credit 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/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DepositAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration