Consolidated Statements of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Net premiums earned	$ 18,398.5	$ 17,103.4	$ 16,018.0
Investment income	408.4	422.0	443.0
Other-than-temporary impairment (OTTI) losses:
Total OTTI losses	(7.9)us-gaap_ImpairmentOfInvestments	(6.0)us-gaap_ImpairmentOfInvestments	(7.3)us-gaap_ImpairmentOfInvestments
Non-credit losses, net of credit losses recognized on previously recorded non-credit OTTI losses	0	(0.1)	(0.7)
Net impairment losses recognized in earnings	(7.9)	(6.1)	(8.0)
Net realized gains (losses) on securities	232.1us-gaap_GainLossOnSaleOfSecuritiesNet	324.5us-gaap_GainLossOnSaleOfSecuritiesNet	314.8us-gaap_GainLossOnSaleOfSecuritiesNet
Total net realized gains (losses) on securities	224.2us-gaap_RealizedInvestmentGainsLosses	318.4us-gaap_RealizedInvestmentGainsLosses	306.8us-gaap_RealizedInvestmentGainsLosses
Fees and other revenues	309.1pgr_FeesAndOtherRevenues	291.8pgr_FeesAndOtherRevenues	281.8pgr_FeesAndOtherRevenues
Service revenues	56.0pgr_NonInsuranceServiceRevenues	39.6pgr_NonInsuranceServiceRevenues	36.1pgr_NonInsuranceServiceRevenues
Gains (losses) on extinguishment of debt	(4.8)	(4.3)	(1.8)
Total revenues	19,391.4us-gaap_Revenues	18,170.9us-gaap_Revenues	17,083.9us-gaap_Revenues
Expenses
Losses and loss adjustment expenses	13,306.2	12,472.4	11,948.0
Policy acquisition costs	1,524.0	1,451.8	1,436.6
Other underwriting expenses	2,467.1us-gaap_OtherUnderwritingExpense	2,350.9us-gaap_OtherUnderwritingExpense	2,206.3us-gaap_OtherUnderwritingExpense
Investment expenses	18.9	18.8	15.4
Service expenses	50.9pgr_NonInsuranceServiceExpenses	38.8pgr_NonInsuranceServiceExpenses	36.1pgr_NonInsuranceServiceExpenses
Interest expense	116.9us-gaap_InterestExpenseDebt	118.2us-gaap_InterestExpenseDebt	123.8us-gaap_InterestExpenseDebt
Total expenses	17,484.0us-gaap_BenefitsLossesAndExpenses	16,450.9us-gaap_BenefitsLossesAndExpenses	15,766.2us-gaap_BenefitsLossesAndExpenses
Net Income
Income before income taxes	1,907.4	1,720.0	1,317.7
Provision for income taxes	626.4us-gaap_IncomeTaxExpenseBenefit	554.6us-gaap_IncomeTaxExpenseBenefit	415.4us-gaap_IncomeTaxExpenseBenefit
Net income	1,281.0us-gaap_NetIncomeLoss	1,165.4us-gaap_NetIncomeLoss	902.3us-gaap_NetIncomeLoss
Net unrealized gains (losses) on securities:
Net non-credit related OTTI losses, adjusted for valuation changes	0	0.3	5.1
Other net unrealized gains (losses) on securities	74.9	84.0	174.8
Total net unrealized gains (losses) on securities	74.9	84.3	179.9
Net unrealized gains on forecasted transactions	(2.6)	(2.0)	(1.8)
Foreign currency translation adjustment	(0.9)	(1.6)	0.4
Other comprehensive income (loss)	71.4	80.7	178.5
Comprehensive income	$ 1,352.4us-gaap_ComprehensiveIncomeNetOfTax	$ 1,246.1us-gaap_ComprehensiveIncomeNetOfTax	$ 1,080.8us-gaap_ComprehensiveIncomeNetOfTax
Computation of Net Income Per Share
Average shares outstanding - Basic (shares)	590.6	599.1	603.3
Net effect of dilutive stock-based compensation (shares)	4.2	4.5	4.5
Total equivalent shares - Diluted (shares)	594.8	603.6	607.8
Basic: Net income per share (USD per share)	$ 2.17us-gaap_EarningsPerShareBasic	$ 1.95us-gaap_EarningsPerShareBasic	$ 1.50us-gaap_EarningsPerShareBasic
Diluted: Net income per share (USD per share)	$ 2.15us-gaap_EarningsPerShareDiluted	$ 1.93us-gaap_EarningsPerShareDiluted	$ 1.48us-gaap_EarningsPerShareDiluted

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