Investments in Unconsolidated Affiliates (Investment in Unconsolidated Affiliates Table) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investments in unconsolidated affiliates
Equity in earnings of unconsolidated affiliates, net of tax	$ 0.0	$ 3.9			$ 0.0	$ 18.0
Symetra | Common Stock
Investments in unconsolidated affiliates
Equity in earnings of unconsolidated affiliates, net of tax		$ 4.2				$ 17.5
Hamer, LLC [Member]
Investments in unconsolidated affiliates
Equity in earnings of unconsolidated affiliates, net of tax			$ 1.1	$ 1.6