Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Available-for-sale (cost: 2012 - $2,985.5; 2011 - $3,095.4)	$ 3,157.5	$ 3,215.5
Equity securities, at fair value (cost: 2012 - $373.3; 2011 - $291.5)	533.3	403.6
Other investments (cost: 2012 - $282.7; 2011 - $232.3)	283.6	232.0
Short-term investments, at fair value (cost: 2012 - $370.5; 2011 - $296.4)	370.5	296.4
Total investments	4,344.9	4,147.5
Cash	142.7	100.9
Accrued investment income	28.8	32.3
Premiums receivable	402.9	309.0
Reinsurance recoverables	1,016.5	1,144.1
Goodwill	153.8	153.8
Intangible assets, net of accumulated amortization	88.4	93.0
Current income taxes receivable, net	21.3	11.2
Deferred acquisition costs, net	107.7	101.5
Ceded unearned premiums	213.0	179.4
Other assets	129.8	105.6
Total assets	6,649.8	6,378.3
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	3,227.9	3,291.1
Unearned premiums	787.0	658.2
Accrued underwriting expenses	96.2	78.5
Ceded reinsurance payable, net	368.0	424.5
Funds held	29.7	35.8
Senior unsecured fixed rate notes	143.8	0
Other indebtedness	64.5	65.5
Junior subordinated debentures	311.5	311.5
Deferred tax liabilities, net	49.7	18.5
Other liabilities	29.6	31.7
Total liabilities	5,107.9	4,915.3
Shareholders' equity:
Common shares - $1.00 par, 500,000,000 shares authorized; 31,358,135 and 31,285,469 shares issued at September 30, 2012 and December 31, 2011, respectively	31.4	31.3
Additional paid-in capital	721.2	716.8
Treasury shares (6,248,209 and 4,971,305 shares at September 30, 2012 and December 31, 2011, respectively)	(198.5)	(160.9)
Retained earnings	783.7	736.0
Accumulated other comprehensive gain, net of taxes	204.1	139.8
Total shareholders' equity	1,541.9	1,463.0
Total liabilities and shareholders' equity	$ 6,649.8	$ 6,378.3