Consolidated Statements of Changes in Shareholders' Equity Statement - USD ($) $ in Millions	Total	Common Shares, $1.00 Par Value	Paid-in Capital	Retained Earnings	Accumulated other comprehensive income after tax
Balance, Beginning of period at Dec. 31, 2013		$ 595.8	$ 1,142.0	$ 3,500.0	$ 951.7
Net income available to Progressive	$ 614.7			614.7
Other comprehensive income (loss)	87.2				87.2
Tax benefit from exercise/vesting of equity-based compensation			10.6
Treasury shares purchased		(5.7)	(11.1)	(123.2)
Net restricted equity awards (issued) (vested) forfeited		1.4	(1.4)
Cash dividends declared on common shares				1.1
Amortization of equity-based compensation			29.8
Reinvested dividends on restricted stock units			(0.6)	(0.6)
Other				(3.7)
Balance, End of period at Jun. 30, 2014	6,789.2	591.5	1,169.3	3,989.5	1,038.9
Accumulated other comprehensive (income) loss attributable to noncontrolling interest	0.0
Redeemable noncontrolling interest (NCI)	0.0		0.0
Accumulated other comprehensive (income) loss attributable to noncontrolling interest	0.0
Redeemable noncontrolling interest (NCI)	0.0
Balance, Beginning of period at Dec. 31, 2014	6,928.6	587.8	1,184.3	4,133.4	1,023.1
Net income available to Progressive	658.9			658.9
Other comprehensive income (loss)	(121.1)				(123.9)
Tax benefit from exercise/vesting of equity-based compensation			8.7
Treasury shares purchased		(4.0)	(8.2)	(95.9)
Net restricted equity awards (issued) (vested) forfeited		2.1	(2.1)
Cash dividends declared on common shares				0.0
Amortization of equity-based compensation			26.5
Reinvested dividends on restricted stock units			(0.1)	(0.1)
Other				(1.6)
Balance, End of period at Jun. 30, 2015	7,359.8	585.9	1,177.0	4,694.9	902.0
Redeemable noncontrolling interest (NCI)	0.0
Net income available to Progressive	363.3
Other comprehensive income (loss)	(147.3)
Balance, End of period at Jun. 30, 2015	7,359.8	$ 585.9	1,177.0	$ 4,694.9	$ 902.0
Accumulated other comprehensive (income) loss attributable to noncontrolling interest	2.8
Redeemable noncontrolling interest (NCI)	$ 433.4		$ (32.1)