Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Net premiums earned	$ 8,824.7	$ 7,634.2	$ 17,284.5	$ 14,808.2
Investment income	261.3	192.1	514.2	358.4
Net realized gains (losses) on securities:
Net realized gains (losses) on security sales	67.5	(9.6)	113.6	97.4
Net holding period gains (losses) on securities	112.4	53.5	505.1	(101.7)
Net impairment losses recognized in earnings	0.0	(11.1)	(24.3)	(11.1)
Total net realized gains (losses) on securities	179.9	32.8	594.4	(15.4)
Fees and other revenues	134.8	116.0	265.0	219.8
Service revenues	50.0	42.9	92.6	77.1
Total revenues	9,450.7	8,018.0	18,750.7	15,448.1
Expenses
Losses and loss adjustment expenses	6,138.1	5,375.3	11,897.1	10,246.1
Policy acquisition costs	738.6	630.8	1,449.2	1,227.0
Other underwriting expenses	1,231.5	1,046.9	2,402.7	2,027.1
Investment expenses	6.2	6.2	12.4	12.2
Service expenses	45.3	37.0	83.4	66.3
Interest expense	47.4	41.7	94.8	78.5
Total expenses	8,207.1	7,137.9	15,939.6	13,657.2
Net Income
Income before income taxes	1,243.6	880.1	2,811.1	1,790.9
Provision for income taxes	264.6	178.9	749.3	359.9
Net income	979.0	701.2	2,061.8	1,431.0
Net (income) loss attributable to noncontrolling interest (NCI)	0.4	3.0	(4.0)	(8.8)
Net income attributable to Progressive	979.4	704.2	2,057.8	1,422.2
Other Comprehensive Income (Loss)
Total net unrealized gains (losses) on fixed-maturity securities	277.4	(50.1)	578.5	(204.6)
Net unrealized losses on forecasted transactions	0.2	0.2	0.4	0.4
Other comprehensive income (loss)	277.6	(49.9)	578.9	(204.2)
Other comprehensive (income) loss attributable to NCI	(2.6)	0.6	(4.9)	4.6
Comprehensive income attributable to Progressive	1,254.4	654.9	2,631.8	1,222.6
Computation of Earnings Per Common Share
Net income attributable to Progressive	979.4	704.2	2,057.8	1,422.2
Less: Preferred share dividends	6.7	6.7	13.4	7.9
Net Income (Loss) Available to Common Stockholders, Basic	$ 972.7	$ 697.5	$ 2,044.4	$ 1,414.3
Average common shares outstanding - Basic	583.6	582.0	583.5	582.0
Net effect of dilutive stock-based compensation	3.3	3.8	3.2	3.6
Total average equivalent common shares - Diluted	586.9	585.8	586.7	585.6
Basic: Earnings per common share	$ 1.67	$ 1.20	$ 3.50	$ 2.43
Diluted: Earnings per common share	$ 1.66	$ 1.19	$ 3.48	$ 2.42