Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Assets
Fixed maturities (amortized cost: $38,564.0, $33,761.1, and $35,589.1)		$ 39,091.8	$ 36,810.9	$ 34,276.6
Short-term investments (amortized cost: $2,243.1, $2,524.2, and $5,218.5)		2,243.1	5,218.5	2,524.2
Total available-for-sale securities		41,334.9	42,029.4	36,800.8
Nonredeemable preferred stocks (cost: $1,453.9, $1,017.5, and $1,358.7)		1,507.2	1,447.9	933.4
Common equities (cost: $1,204.5, $1,113.2, and $1,187.3)		4,558.5	4,053.0	2,608.1
Total equity securities		6,065.7	5,500.9	3,541.5
Total investments		47,400.6	47,530.3	40,342.3
Cash and cash equivalents		122.9	76.5	369.5
Restricted cash		0.3	0.0	0.9
Cash and cash equivalents		123.2	76.5	370.4
Accrued investment income		166.0	176.4	171.6
Premiums receivable, net of allowance for credit losses of $265.3, $344.7, and $356.2		9,218.8	8,160.1	7,568.3
Reinsurance recoverables		4,143.2	4,019.4	3,639.6
Prepaid reinsurance premiums		667.6	368.1	438.2
Deferred acquisition costs		1,309.1	1,237.2	1,095.8
Property and equipment, net of accumulated depreciation of $1,318.5, $1,191.6, and $1,291.4		1,077.4	1,106.0	1,215.1
Goodwill		452.7	452.7	452.7
Intangible assets, net of accumulated amortization of $340.3, $328.5, and $326.1		157.2	171.4	213.8
Net federal deferred income taxes		0.0	0.0	20.6
Other assets		697.5	800.2	738.0
Total assets		65,413.3	64,098.3	56,266.4
Liabilities
Unearned premiums		15,045.9	13,437.5	12,641.1
Loss and loss adjustment expense reserves		21,063.7	20,265.8	18,306.5
Net federal deferred income taxes		241.5	310.0	0.0
Dividends Payable		58.5	2,694.5	58.5
Accounts payable, accrued expenses, and other liabilities		5,770.4	4,955.8	5,289.2
Debt	[1]	5,396.8	5,396.1	5,394.0
Total liabilities		47,576.8	47,059.7	41,689.3
Redeemable noncontrolling interest (NCI)		0.0	0.0	225.6
Shareholders’ Equity
Serial Preferred Shares, Series B, no par value (cumulative, liquidation preference $1,000 per share) (authorized, issued, and outstanding 0.5)		493.9	493.9	493.9
Common shares, $1.00 par value (authorized 900.0; issued 797.5, including treasury shares of 212.3, 212.2, and 212.3)		585.2	585.2	585.3
Paid-in capital		1,685.5	1,672.9	1,601.9
Retained earnings		14,679.6	13,354.9	11,266.2
Accumulated other comprehensive income (loss):
Net unrealized gains (losses) on fixed-maturity securities		407.7	947.3	423.6
Net unrealized losses on forecasted transactions		(15.4)	(15.6)	(16.2)
Accumulated other comprehensive income attributable to NCI		0.0	0.0	(3.2)
Total accumulated other comprehensive income (loss) attributable to Progressive		392.3	931.7	404.2
Total shareholders’ equity		17,836.5	17,038.6	14,351.5
Total liabilities, redeemable NCI, and shareholders’ equity		$ 65,413.3	$ 64,098.3	$ 56,266.4

[1] Consists of both short-term and long-term debt. See Note 4 – Debt for further discussion.