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Segment Information Operating Results (Parenthetical) (Details) (Personal Lines, Personal Auto, Underwriting Operations)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Personal Lines | Personal Auto | Underwriting Operations
      
Segment Reporting Information [Line Items]      
Personal auto insurance percentage of the total personal lines segment net premiums earned 92.00%pgr_PercentageOfSegmentRevenueAttributableToPersonalAutoInsurance
/ us-gaap_ConsolidationItemsAxis
= pgr_UnderwritingOperationsMember
/ us-gaap_ProductOrServiceAxis
= pgr_PersonalAutoMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember		 91.00%pgr_PercentageOfSegmentRevenueAttributableToPersonalAutoInsurance
/ us-gaap_ConsolidationItemsAxis
= pgr_UnderwritingOperationsMember
/ us-gaap_ProductOrServiceAxis
= pgr_PersonalAutoMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember		 91.00%pgr_PercentageOfSegmentRevenueAttributableToPersonalAutoInsurance
/ us-gaap_ConsolidationItemsAxis
= pgr_UnderwritingOperationsMember
/ us-gaap_ProductOrServiceAxis
= pgr_PersonalAutoMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember