Condensed Consolidated Statements of Changes in Shareholder's Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit)
Balance at Dec. 31, 2010 (As previously filed)	$ 3,458.3	$ 2.8	$ 4,326.0	$ 304.5	$ (1,175.0)
Balance (Cumulative effect of changes in accounting) (Deferred policy acquisition costs)	(366.3)			64.7	(431.0)
Balance (Cumulative effect of changes in accounting) (Actuarial gains (losses) for pension and post-retirement benefit plans)				21.3	(21.3)
Balance at Dec. 31, 2010	3,092.0	2.8	4,326.0	390.5	(1,627.3)
Increase (Decrease) in Stockholders' Equity
Net income	280.8				280.8
Comprehensive income:
Other comprehensive income (loss), after tax	264.4			264.4
Comprehensive income (loss)	545.2
Cash Dividends Paid to Parent Company	0
Contribution of capital	201.0		201.0
Employee related benefits	0.5		0.5
Balance at Sep. 30, 2011	3,838.7	2.8	4,527.5	654.9	(1,346.5)
Balance at Dec. 31, 2011	3,976.3	2.8	4,533.0	747.5	(1,307.0)
Increase (Decrease) in Stockholders' Equity
Net income	275.2				275.2
Comprehensive income:
Other comprehensive income (loss), after tax	306.7			306.7
Comprehensive income (loss)	581.9
Cash Dividends Paid to Parent Company	(340.0)		(340.0)
Employee related benefits	23.9		23.9
Balance at Sep. 30, 2012	$ 4,242.1	$ 2.8	$ 4,216.9	$ 1,054.2	$ (1,031.8)