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Income Taxes Reconciliation of Provision (Benefit) for income Taxes Reported in Consolidated Statements Of Income with Tax at Statutory Rate (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income before income taxes $ 1,907.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,720.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,317.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Tax at statutory rate 667.6us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 602.0us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 461.2us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Dividends received deduction (18.3)pgr_IncomeTaxReconciliationDeductionsDividendsReceived (17.6)pgr_IncomeTaxReconciliationDeductionsDividendsReceived (18.2)pgr_IncomeTaxReconciliationDeductionsDividendsReceived
Exempt interest income (13.8)us-gaap_IncomeTaxReconciliationTaxExemptIncome (13.1)us-gaap_IncomeTaxReconciliationTaxExemptIncome (14.7)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Tax-deductible dividends (6.5)pgr_IncomeTaxReconciliationDeductionsDividendsPaid (13.6)pgr_IncomeTaxReconciliationDeductionsDividendsPaid (11.9)pgr_IncomeTaxReconciliationDeductionsDividendsPaid
Tax credits (2.2)us-gaap_IncomeTaxReconciliationTaxCredits (2.3)us-gaap_IncomeTaxReconciliationTaxCredits 0us-gaap_IncomeTaxReconciliationTaxCredits
Other items, net (0.4)us-gaap_IncomeTaxReconciliationOtherAdjustments (0.8)us-gaap_IncomeTaxReconciliationOtherAdjustments (1.0)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax provision $ 626.4us-gaap_IncomeTaxExpenseBenefit $ 554.6us-gaap_IncomeTaxExpenseBenefit $ 415.4us-gaap_IncomeTaxExpenseBenefit
Tax at statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Dividends received deduction (1.00%)pgr_EffectiveIncomeTaxRateReconciliationDeductionsDividendsReceived (1.00%)pgr_EffectiveIncomeTaxRateReconciliationDeductionsDividendsReceived (1.00%)pgr_EffectiveIncomeTaxRateReconciliationDeductionsDividendsReceived
Exempt interest income (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Tax-deductible dividends 0.00%pgr_EffectiveIncomeTaxRateReconciliationDeductionsDividendsPaid (1.00%)pgr_EffectiveIncomeTaxRateReconciliationDeductionsDividendsPaid (1.00%)pgr_EffectiveIncomeTaxRateReconciliationDeductionsDividendsPaid
Tax credits 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Other items, net 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total income tax provision 33.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations