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Reinsurance Prepaid Reinsurance Premiums and Reinsurance Recoverables (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Prepaid reinsurance premiums $ 85.3us-gaap_PrepaidReinsurancePremiums $ 74.9us-gaap_PrepaidReinsurancePremiums
Percentage of Prepaid Reinsurance Premiums 100.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums 100.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
Reinsurance Recoverables 1,231.9us-gaap_ReinsuranceRecoverables 1,090.2us-gaap_ReinsuranceRecoverables
Percentage of Reinsurance Recoverables 100.00%pgr_PercentageOfTotalReinsuranceRecoverables 100.00%pgr_PercentageOfTotalReinsuranceRecoverables
State Reinsurance Plan    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Prepaid reinsurance premiums 81.2us-gaap_PrepaidReinsurancePremiums
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 71.1us-gaap_PrepaidReinsurancePremiums
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Percentage of Prepaid Reinsurance Premiums 95.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 95.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Reinsurance Recoverables 1,180.0us-gaap_ReinsuranceRecoverables
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 1,005.3us-gaap_ReinsuranceRecoverables
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Percentage of Reinsurance Recoverables 96.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 92.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
State Reinsurance Plan | Michigan Catastrophic Claims Association    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Prepaid reinsurance premiums 32.8us-gaap_PrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_MichiganCatastrophicClaimsAssociationMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 29.5us-gaap_PrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_MichiganCatastrophicClaimsAssociationMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Percentage of Prepaid Reinsurance Premiums 38.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_MichiganCatastrophicClaimsAssociationMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 40.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_MichiganCatastrophicClaimsAssociationMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Reinsurance Recoverables 1,018.8us-gaap_ReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_MichiganCatastrophicClaimsAssociationMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 875.9us-gaap_ReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_MichiganCatastrophicClaimsAssociationMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Percentage of Reinsurance Recoverables 83.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_MichiganCatastrophicClaimsAssociationMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 80.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_MichiganCatastrophicClaimsAssociationMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
State Reinsurance Plan | Commercial Auto Insurance Procedures Plans    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Prepaid reinsurance premiums 26.5us-gaap_PrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_CommercialAutoInsuranceProceduresPlansMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 21.1us-gaap_PrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_CommercialAutoInsuranceProceduresPlansMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Percentage of Prepaid Reinsurance Premiums 31.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_CommercialAutoInsuranceProceduresPlansMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 28.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_CommercialAutoInsuranceProceduresPlansMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Reinsurance Recoverables 110.1us-gaap_ReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_CommercialAutoInsuranceProceduresPlansMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 79.3us-gaap_ReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_CommercialAutoInsuranceProceduresPlansMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Percentage of Reinsurance Recoverables 9.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_CommercialAutoInsuranceProceduresPlansMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 7.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_CommercialAutoInsuranceProceduresPlansMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
State Reinsurance Plan | North Carolina Reinsurance Facility    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Prepaid reinsurance premiums 21.9us-gaap_PrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_NorthCarolinaReinsuranceFacilityMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 20.5us-gaap_PrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_NorthCarolinaReinsuranceFacilityMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Percentage of Prepaid Reinsurance Premiums 26.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_NorthCarolinaReinsuranceFacilityMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 27.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_NorthCarolinaReinsuranceFacilityMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Reinsurance Recoverables 51.1us-gaap_ReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_NorthCarolinaReinsuranceFacilityMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 50.1us-gaap_ReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_NorthCarolinaReinsuranceFacilityMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Percentage of Reinsurance Recoverables 4.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_NorthCarolinaReinsuranceFacilityMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember		 5.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_StateProvidedReinsuranceFacilityAxis
= pgr_NorthCarolinaReinsuranceFacilityMember
/ pgr_StateReinsurancePlansAxis
= pgr_StateReinsurancePlansMember
Non-State Reinsurance Plans    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Prepaid reinsurance premiums 4.1us-gaap_PrepaidReinsurancePremiums
/ pgr_NonStateReinsurancePlansAxis
= pgr_NonStateReinsurancePlansMember		 3.8us-gaap_PrepaidReinsurancePremiums
/ pgr_NonStateReinsurancePlansAxis
= pgr_NonStateReinsurancePlansMember
Percentage of Prepaid Reinsurance Premiums 5.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_NonStateReinsurancePlansAxis
= pgr_NonStateReinsurancePlansMember		 5.00%pgr_PercentageOfTotalPrepaidReinsurancePremiums
/ pgr_NonStateReinsurancePlansAxis
= pgr_NonStateReinsurancePlansMember
Reinsurance Recoverables $ 51.9us-gaap_ReinsuranceRecoverables
/ pgr_NonStateReinsurancePlansAxis
= pgr_NonStateReinsurancePlansMember		 $ 84.9us-gaap_ReinsuranceRecoverables
/ pgr_NonStateReinsurancePlansAxis
= pgr_NonStateReinsurancePlansMember
Percentage of Reinsurance Recoverables 4.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_NonStateReinsurancePlansAxis
= pgr_NonStateReinsurancePlansMember		 8.00%pgr_PercentageOfTotalReinsuranceRecoverables
/ pgr_NonStateReinsurancePlansAxis
= pgr_NonStateReinsurancePlansMember