Disposal of U.K. Motor Business (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) item
Disposal of U.K. Motor Business [Abstract]
Reinsurance arrangement	100.00%
Entites sold | item	2
Proceeds	$ 64.9
Net gain	40.3
Insurance liabilities ceded	443.0
Written premiums ceded	137.4
Investments, cash, and premiums receivable transferred	419.0
DAC balance written off	$ 25.0