Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss)	$ 93.3	$ 76.8	$ 275.2	$ 280.8
Other comprehensive income (loss), before tax:
Unrealized gains/losses on securities	253.9	300.8	455.4	305.2
Other-than-temporary impairments	7.0	(84.7)	10.6	18.3
Pension and other post-employment benefit liability	(0.6)	0	(1.7)	(0.1)
Other comprehensive income (loss), before tax	260.3	216.1	464.3	323.4
Income tax benefit (expense) related to items of other comprehensive income (loss)	(98.2)	(29.3)	(157.6)	(59.0)
Other comprehensive income (loss), after tax	162.1	186.8	306.7	264.4
Comprehensive income (loss)	$ 255.4	$ 263.6	$ 581.9	$ 545.2