Investments - Impaired Loans 3 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Impaired loans, average investment during the period	$ 94.2	[1]	$ 16.9	[1]
Interest income recognized on impaired loans, on an accrual basis	1.3	[1]	0.2	[1]
Interest income recognized on impaired loans, on a cash basis	1.0	[1]	0.2	[1]
Interest income recognized on troubled debt restructured loans, on an accrual basis	$ 1.2		$ 0

[1] Includes amounts for Troubled debt restructured loans.