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Deferred Policy Acquisition Costs and Deferred Sales Inducements (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Policy Acquisition Costs and Deferred Sales Inducements [Abstract]      
Deferred policy acquisition costs, increase (decrease) in amortization due to unlocking adjustment $ (11.0) $ (35.5) $ (18.5)
Deferred sales inducements, increase (decrease) in amortization due to unlocking adjustment $ (5.6) $ (12.6) $ (11.1)