Commitments and Contingencies (Restricted Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Loss Contingencies [Line Items]
Other fixed maturities-state deposits	$ 13.2		$ 13.1
Securities pledged	211.8	[1]	140.1	[1]
Total restricted assets	225.0		153.2
Fair value of loaned securities	158.0		97.6
Securities pledged as collateral	211.8		140.1
Fixed maturities
Loss Contingencies [Line Items]
Securities pledged as collateral	$ 53.8		$ 42.5

[1] Includes the fair value of loaned securities of $158.0 and $97.6 as of March 31, 2014 and December 31, 2013, respectively, which is included in Securities pledged on the Condensed Consolidated Balance Sheets. In addition, as of March 31, 2014 and December 31, 2013, the Company delivered securities as collateral of $53.8 and $42.5, respectively, which was included in Securities pledged on the Condensed Consolidated Balance Sheets.