Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Investments:
Fixed maturities at fair value (amortized cost of $4,598.8 and $4,520.3)	$ 4,797.9	$ 4,615.6
Equity securities at fair value (cost of $120.7 and $57.3)	128.6	69.2
Other long-term investments	39.4	32.3
Total investments	4,965.9	4,717.1
Cash and cash equivalents	290.4	316.5
Accrued investment income	53.8	52.3
Premiums and accounts receivable, net	772.0	590.8
Reinsurance receivable on paid and unpaid losses, benefits and unearned premiums	1,254.2	1,197.9
Deferred policy acquisition costs	345.3	286.3
Deferred federal income taxes	177.4	228.6
Goodwill	179.2	171.4
Other assets	398.1	351.2
Assets of discontinued operations	133.6	130.6
Total assets	8,569.9	8,042.7
Policy liabilities and accruals:
Losses and loss adjustment expenses	3,277.7	3,153.9
Unearned premiums	1,520.3	1,300.5
Total policy liabilities and accruals	4,798.0	4,454.4
Expenses and taxes payable	541.7	603.2
Reinsurance premiums payable	34.4	58.5
Debt	605.9	433.9
Liabilities of discontinued operations	129.4	134.1
Total liabilities	6,109.4	5,684.1
Commitments and contingencies (Notes 15 and 19)
Shareholders' Equity
Preferred stock, $.01 par value, 20.0 million shares authorized, issued none
Common stock, $.01 par value, 300.0 million shares authorized, 60.5 million shares issued	0.6	0.6
Additional paid-in capital	1,796.5	1,808.5
Accumulated other comprehensive income	136.7	28.8
Retained earnings	1,246.8	1,141.1
Treasury stock at cost (15.6 million and 13.0 million shares)	(720.1)	(620.4)
Total shareholders' equity	2,460.5	2,358.6
Total liabilities and shareholders' equity	$ 8,569.9	$ 8,042.7