Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013		Mar. 31, 2014 Foreign tax credits	Mar. 31, 2014 Tax valuation allowance allocated to Net income (loss)	Dec. 31, 2013 Tax valuation allowance allocated to Net income (loss)	Mar. 31, 2014 Tax valuation allowance allocated to Other comprehensive income	Dec. 31, 2013 Tax valuation allowance allocated to Other comprehensive income	Dec. 31, 2013 Operating loss carryforwards Foreign tax credits
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Income (loss) before income taxes	$ 61.7	$ 106.9
Tax rate	35.00%	35.00%
Income tax expense (benefit) at federal statutory rate	21.6	37.4
Dividends received deduction	(6.0)	(5.3)
IRS audit adjustment	(0.1)	(0.3)
Other	0.5	0	[1]
Income tax expense (benefit)	16.0	31.8
Valuation allowance, deferred tax assets				11.1	130.4	130.4	(119.3)	(119.3)	11.1
Increase (decrease) in valuation allowance	$ 0	$ 0

[1] Less than $0.1.