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Deferred Policy Acquisition Costs and Deferred Sales Inducements (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Insurance [Abstract]      
Deferred policy acquisition costs, increase (decrease) in amortization due to unlocking adjustment $ 48.2 $ (11.0) $ (35.5)
Deferred sales inducements, increase (decrease) in amortization due to unlocking adjustment $ 35.8 $ (5.6) $ (12.6)