Investments - Schedule of Other Than Temporary Impairment (Details) (Fixed Maturities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fixed Maturities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at Beginning of Period	$ 9.9	$ 4.6
Additions for Previously Unrecognized OTTI Credit Losses	0	0.7
Increases to Previously Recognized OTTI Credit Losses	0.3	0
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell	0	1.1
Reductions for Investments Sold During Period	0	(0.1)
Balance at End of Period	$ 10.2	$ 4.1