Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Tax valuation allowance, continuing operations	Dec. 31, 2011 Tax valuation allowance, continuing operations	Jun. 30, 2012 Tax valuation allowance, realized and unrealized capital losses	Dec. 31, 2011 Tax valuation allowance, realized and unrealized capital losses	Jun. 30, 2012 Tax valuation allowance, foreign tax credits	Dec. 31, 2011 Tax valuation allowance, foreign tax credits
Valuation Allowance [Line Items]
Valuation allowance, deferred tax assets					$ 63.0	$ 53.0	$ (62.0)	$ (52.0)	$ 11.1	$ 11.1
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory rate	35.00%	35.00%	35.00%	35.00%
Dividend received deduction	(10.30%)	(1.80%)	(4.40%)	(1.80%)
Valuation allowance	10.20%	(6.60%)	3.60%	3.90%
IRS audit adjustment	0.00%	0.00%	(0.10%)	1.10%
Other	0.20%	0.40%	0.10%	0.20%
Effective rate at June 30	35.10%	27.00%	34.20%	38.40%