Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Cash Flows From Operating Activities
Net income	$ 865.6		$ 653.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	74.9		69.1
Amortization of fixed-income securities	111.4		145.3
Amortization of equity-based compensation	49.8		45.8
Net realized (gains) losses on securities	(241.4)		(244.7)
Net (gains) losses on disposition of property and equipment	4.1		4.8
(Gains) losses on extinguishment of debt	4.3		1.8
Changes in:
Premiums receivable	(317.4)		(426.2)
Reinsurance recoverables	(130.9)		(62.5)
Prepaid reinsurance premiums	(16.3)		(3.0)
Deferred acquisition costs	(40.2)		(28.2)
Income taxes	77.3		45.7
Unearned premiums	548.0		624.0
Loss and loss adjustment expense reserves	472.0		514.4
Accounts payable, accrued expenses, and other liabilities	277.4		306.6
Other, net	9.4		19.2
Net cash provided by operating activities	1,748.0		1,665.3
Purchases:
Fixed maturities	(6,070.8)		(3,997.0)
Equity securities	(260.2)		(176.1)
Sales:
Fixed maturities	2,352.8		2,416.0
Equity securities	308.0		737.4
Maturities, paydowns, calls, and other:
Fixed maturities	1,338.7		1,094.1
Equity securities	0		4.0
Net (purchases) sales of short-term investments—other	843.0		(842.9)
Net unsettled security transactions	154.6		14.5
Purchases of property and equipment	(105.6)		(84.2)
Sales of property and equipment	2.4		3.4
Net cash used in investing activities	(1,437.1)		(830.8)
Cash Flows From Financing Activities
Proceeds from exercise of stock options	0		0.5
Tax benefit from exercise/vesting of equity-based compensation	10.3		5.6
Payment of debt	0		(350.0)
Reacquisition of debt	(58.1)		(32.5)
Dividends paid to shareholders	(175.6)	[1]	(252.4)	[1]
Acquisition of treasury shares	(164.8)		(170.1)
Net cash used in financing activities	(388.2)		(798.9)
Effect of exchange rate changes on cash	(0.9)		0.9
Increase (decrease) in cash	(78.2)		36.5
Cash, Beginning of year	179.1		155.7
Cash, End of year	$ 100.9		$ 192.2

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