CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 110.9	$ (12.9)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net realized investment gains	(3.8)	(13.4)
Net amortization and depreciation	26.0	12.3
Net gain on sale of Citizens Management, Inc.	(10.8)
Stock-based compensation expense	9.8	9.7
Amortization of deferred benefit plan costs	7.0	7.7
Deferred income taxes	21.9	13.8
Change in deferred acquisition costs	(42.6)	17.6
Change in accrued interest income	(2.9)	(30.7)
Change in premiums receivable, net of reinsurance premiums payable	(87.5)	41.1
Change in loss, loss adjustment expense and unearned premium reserves	442.1	254.6
Change in reinsurance recoverable	(181.3)	(53.7)
Change in expenses and taxes payable	(23.8)	62.7
Other, net	(60.4)	(22.5)
Net cash provided by operating activities	204.6	286.3
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from disposals and maturities of fixed maturities	1,267.4	1,138.2
Proceeds from disposals of equity securities and other investments	21.7	17.7
Purchases of fixed maturities	(1,601.1)	(1,122.5)
Purchases of equity securities and other investments	(206.1)	(58.6)
Proceeds from disposal of Citizens Management, Inc., net of cash transferred	5.2
Cash used for business acquisitions, net of cash acquired		268.4
Capital expenditures	(11.2)	(9.8)
Net payments related to derivative agreements	(4.4)	(2.2)
Net cash provided by (used in) investing activities	(528.5)	231.2
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of employee stock options	1.9	3.9
Proceeds from debt borrowings	7.4	314.4
Decrease in cash collateral related to securities lending program	(6.6)	(32.6)
Dividends paid to shareholders	(40.3)	(37.5)
Repurchases of debt	(0.8)	(86.8)
Repurchases of common stock	(20.0)	(20.0)
Other financing activities	(0.2)	(0.6)
Net cash provided by (used in) financing activities	(58.6)	140.8
Effect of exchange rate changes on cash	24.0	(28.4)
Net change in cash and cash equivalents	(358.5)	629.9
Net change in cash related to discontinued operations	0.1	2.4
Cash and cash equivalents, beginning of period	820.4	290.4
Cash and cash equivalents, end of period	$ 462.0	$ 922.7