Consolidated Statements of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Revenues
Net premiums earned	$ 4,513.5		$ 4,277.0		$ 8,915.8		$ 8,456.3
Period over prior year period percent change in net premiums earned	6.00%				5.00%
Investment income	99.2		102.2		202.5		202.7
Period over prior year period percent change in investment income	(3.00%)				0.00%
Other-than-temporary impairment (OTTI) losses:
Total OTTI losses	0		(1.5)		0		(1.7)
Period over prior year period percent change in total OTTI losses	(100.00%)				(100.00%)
Non-credit losses, net of credit losses recognized on previously recorded non-credit OTTI losses	0		(0.1)		0		(0.1)
Period over prior year period percent change in non-credit losses, net of credit losses recognized on previously recorded non-credit other than temporary impairment losses	(100.00%)				(100.00%)
Net impairment losses recognized in earnings	0		(1.6)		0		(1.8)
Period over prior year period percent change in net impairment losses recognized in earnings	(100.00%)				(100.00%)
Net realized gains (losses) on securities	40.4		134.5		159.8		215.3
Period over prior year period percent change in net realized gains (losses) on securities	(70.00%)				(26.00%)
Total net realized gains (losses) on securities	40.4		132.9		159.8		213.5
Period over prior year period percent change in total net realized gains (losses) on securities	(70.00%)				(25.00%)
Fees and other revenues	74.4		70.9		147.2		139.3
Period over prior year period percent change in fees and other revenues	5.00%				6.00%
Service revenues	14.0		10.6		23.8		19.0
Period over prior year period percent change in service revenues	32.00%				25.00%
Total revenues	4,741.5		4,593.6		9,449.1		9,030.8
Period over prior year period percent change in total revenues	3.00%				5.00%
Expenses
Losses and loss adjustment expenses	3,269.1		3,117.0		6,475.0		6,102.5
Period over prior year period percent change in losses and loss adjustment expenses	5.00%				6.00%
Policy acquisition costs	374.8		364.0		743.8		722.9
Period over prior year period percent change in policy acquisition costs	3.00%				3.00%
Other underwriting expenses	611.7		581.1		1,222.1		1,166.7
Period over prior year period percent change in other underwriting expenses	5.00%				5.00%
Investment expenses	6.0		4.4		10.1		9.3
Period over prior year period percent change in investment expenses	36.00%				9.00%
Service expenses	12.9		10.4		22.6		19.0
Period over prior year period percent change in service expenses	24.00%				19.00%
Interest expense	29.6		30.4		56.3		61.0
Period over prior year period percent change in interest expense	(3.00%)				(8.00%)
Total expenses	4,304.1		4,107.3		8,529.9		8,081.4
Period over prior year period percent change in total expenses	5.00%				6.00%
Net Income
Income before income taxes	437.4		486.3		919.2		949.4
Period over prior year period percent change in income before income taxes	(10.00%)				(3.00%)
Provision for income taxes	144.0		161.7		304.5		316.2
Period over prior year period percent change in provision for income taxes	(11.00%)				(4.00%)
Net income	293.4		324.6		614.7		633.2
Period over prior year period percent change in net income	(10.00%)				(3.00%)
Net unrealized gains (losses) on securities:
Net non-credit related OTTI losses, adjusted for valuation changes	0		0.1		0		0.3
Period over prior year period percent change in net non-credit related OTTI losses, adjusted for valuation changes	(100.00%)				(100.00%)
Other net unrealized gains (losses) on securities	88.4		(154.4)		88.3		(55.4)
Period over prior year period percent change in other net unrealized gains (losses) on securities	(157.00%)				(259.00%)
Total net unrealized gains (losses) on securities	88.4		(154.3)		88.3		(55.1)
Period over prior year period percent change in total net unrealized gains (losses) on securities	(157.00%)				(260.00%)
Net unrealized gains on forecasted transactions	(1.3)		(0.4)		(1.6)		(0.7)
Period over prior year period percent change in net unrealized gains on forecasted transactions	225.00%				129.00%
Foreign currency translation adjustment	0.5		(0.8)		0.5		(1.0)
Period over prior year period percent change in foreign currency translation adjustment	(163.00%)				(150.00%)
Other comprehensive income (loss)	87.6		(155.5)		87.2		(56.8)
Period over prior year period percent change in other comprehensive income (loss)	(156.00%)				(254.00%)
Comprehensive income	$ 381.0		$ 169.1		$ 701.9		$ 576.4
Period over prior year period percent change in comprehensive income	125.00%				22.00%
Computation of Net Income Per Share
Average shares outstanding - Basic (shares)	591.2		599.5		592.6		600.1
Period over prior year period percent change in average shares outstanding - basic	(1.00%)				(1.00%)
Net effect of dilutive stock-based compensation (shares)	4.3		4.1		4.0		3.9
Period over prior year period percent change in net effect of dilutive stock-based compensation	5.00%				3.00%
Total equivalent shares - Diluted (shares)	595.5		603.6		596.6		604.0
Period over prior year period percent change in total equivalent shares - diluted	(1.00%)				(1.00%)
Basic: Net income per share (USD per share)	$ 0.50		$ 0.54		$ 1.04		$ 1.06
Period over prior year period percent change in basic: net income per share	(8.00%)				(2.00%)
Diluted: Net income per share (USD per share)	$ 0.49		$ 0.54		$ 1.03		$ 1.05
Period over prior year period percent change in diluted: net income per share	(8.00%)				(2.00%)
Dividends declared per share (USD per share)	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]

[1] Progressive maintains an annual dividend program. See Note 8 - Dividends for further discussion.