Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income (loss)	$ 37.9	$ 116.6	$ 181.9	$ 204.0
Other comprehensive income (loss), before tax:
Unrealized gains/losses on securities	273.9	20.5	201.5	4.4
Other-than-temporary impairments	2.0	97.7	3.6	103.0
Pension and other post-employment benefit liability	(0.5)	(0.1)	(1.1)	(0.1)
Other comprehensive income (loss), before tax	275.4	118.1	204.0	107.3
Income tax benefit (expense) related to items of other comprehensive income (loss)	(90.5)	(27.8)	(59.4)	(29.7)
Other comprehensive income (loss), after tax	184.9	90.3	144.6	77.6
Comprehensive income (loss)	$ 222.8	$ 206.9	$ 326.5	$ 281.6