CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $) In Millions	Total	Common stock and additional paid-in capital	Accumulated other comprehensive income (loss)	Retained earnings (accumulated deficit)
Balance at Dec. 31, 2009	$ 3,532.4	$ 4,411.3	$ (264.3)	$ (614.6)
Comprehensive income (loss), net of tax:
Net income	116.4	0	0	116.4
Change in unrealized appreciation (depreciation) of investments (net of applicable income tax expense)	902.1	0	902.1	0
Change in noncredit component of impairment losses on fixed maturities, available for sale (net of applicable income tax expense)	56.5	0	56.5	0
Total comprehensive income (loss)	1,075.0
Cumulative effect of accounting change	(15.9)	0	(6.2)	(9.7)
Beneficial conversion feature related to the issuance of convertible debentures	4.0	4.0	0	0
Stock option and restricted stock plans	8.8	8.8	0	0
Balance at Sep. 30, 2010	4,604.3	4,424.1	688.1	(507.9)
Balance at Dec. 31, 2010	4,325.3	4,426.7	238.3	(339.7)
Comprehensive income (loss), net of tax:
Net income	309.4	0	0	309.4
Change in unrealized appreciation (depreciation) of investments (net of applicable income tax expense)	355.8	0	355.8	0
Change in noncredit component of impairment losses on fixed maturities, available for sale (net of applicable income tax expense)	3.2	0	3.2	0
Total comprehensive income (loss)	668.4
Cost of shares acquired	(55.7)	55.7	0	0
Stock option and restricted stock plans	10.8	10.8	0	0
Balance at Sep. 30, 2011	$ 4,948.8	$ 4,381.8	$ 597.3	$ (30.3)