CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments:
Fixed maturities, at fair value (amortized cost of $6,310.6 and $6,529.5)	$ 6,723.5	$ 6,952.2
Equity securities, at fair value (cost of $391.2 and $299.0)	435.0	315.8
Other investments	207.5	210.3
Total investments	7,366.0	7,478.3
Cash and cash equivalents	691.0	564.8
Accrued investment income	68.9	69.0
Premiums and accounts receivable, net	1,318.1	1,308.8
Reinsurance recoverable on paid and unpaid losses and unearned premiums	2,435.5	2,479.7
Deferred acquisition costs	494.7	489.5
Deferred income taxes	238.5	267.6
Goodwill	184.4	184.9
Other assets	524.4	511.8
Assets of discontinued operations	120.6	130.5
Total assets	13,442.1	13,484.9
Liabilities
Loss and loss adjustment expense reserves	6,092.5	6,197.0
Unearned premiums	2,488.1	2,474.8
Expenses and taxes payable	660.3	775.8
Reinsurance premiums payable	475.9	466.2
Debt	978.1	849.4
Liabilities of discontinued operations	123.2	126.3
Total liabilities	10,818.1	10,889.5
Commitments and contingencies
Shareholders' Equity
Preferred stock, par value $0.01 per share; 20.0 million shares authorized; none issued
Common stock, par value $0.01 per share; 300.0 million shares authorized; 60.5 million shares issued	0.6	0.6
Additional paid-in capital	1,785.3	1,787.1
Accumulated other comprehensive income	323.1	325.8
Retained earnings	1,252.8	1,211.6
Treasury stock at cost (16.5 and 16.2 million shares)	(737.8)	(729.7)
Total shareholders' equity	2,624.0	2,595.4
Total liabilities and shareholders' equity	$ 13,442.1	$ 13,484.9