XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.23.3

Fair Value - Summary of Changes in Fair Value Associated with Level 3 Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | $ 112.0 | $ 100.4 | $ 121.9 | $ 127.7
Calls/ Maturities/ Paydowns | 0.7 | 0.2 | 2.8 | 1.3
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | (10.0) | 0.0 | (10.0) | (15.0)
Net Realized (Gain)/Loss on Sales | 8.9 | 0.0 | 8.9 | (17.2)
Change in Valuation | (7.0) | 0.0 | (19.0) | 3.8
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | 104.6 | 100.6 | 104.6 | 100.6
Total equity securities | Financials | Nonredeemable preferred stocks |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 56.0 | 64.9 | 67.4 | 76.4
Calls/ Maturities/ Paydowns | (8.1) | 0.0 | (8.1) | 0.0
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | (15.0)
Net Realized (Gain)/Loss on Sales | 0.0 | 0.0 | 0.0 | (17.2)
Change in Valuation | 0.0 | 0.0 | (11.4) | 20.7
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | 47.9 | 64.9 | 47.9 | 64.9
Total equity securities | Industrials | Nonredeemable preferred stocks |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 15.8 | 17.0 | 16.4 | 34.4
Calls/ Maturities/ Paydowns | 0.0 | 0.0 | 0.0 | (0.5)
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Net Realized (Gain)/Loss on Sales | 0.0 | 0.0 | 0.0 | 0.0
Change in Valuation | 0.0 | 0.0 | (0.6) | (16.9)
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | 15.8 | 17.0 | 15.8 | 17.0
Total equity securities | Common Stocks, excluding Other Risk | Common equities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 18.3 | 0.0 | 18.3 |
Calls/ Maturities/ Paydowns | 8.1 | 0.0 | 8.1 |
Purchases | 0.0 | 0.0 | 0.0 |
Sales | (10.0) | 0.0 | (10.0) |
Net Realized (Gain)/Loss on Sales | 8.9 | 0.0 | 8.9 |
Change in Valuation | (7.0) | 0.0 | (7.0) |
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 |
Fair value, ending balance | 18.3 | 0.0 | 18.3 | 0.0
Total equity securities | Other risk investments | Common equities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 21.9 | 18.5 | 19.8 | 16.9
Calls/ Maturities/ Paydowns | 0.7 | 0.2 | 2.8 | 1.8
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Net Realized (Gain)/Loss on Sales | 0.0 | 0.0 | 0.0 | 0.0
Change in Valuation | 0.0 | 0.0 | 0.0 | 0.0
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | $ 22.6 | $ 18.7 | $ 22.6 | $ 18.7

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pgr_InvestmentCategoryAxis=us-gaap_BanksTrustAndInsuranceEquitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_NonredeemablePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pgr_InvestmentCategoryAxis=us-gaap_IndustrialMiscellaneousAndAllOthersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pgr_InvestmentCategoryAxis=us-gaap_CommonStocksByIndustryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pgr_InvestmentCategoryAxis=pgr_OtherRiskInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |