Investment Securities (Fair Value Measurements) (Details) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	$ 32.1	$ 56.3
Fixed maturity investments reclassified to assets held for sale			338,100,000
Maximum percentage of price difference provided by pricing services	5.00%
Maximum price difference provided by pricing services	1,000,000
Fair value, investment-related liabilities	81,100,000		79,700,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	90.3
Fair value investments	$ 1.3