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Reinsurance and Policy Provisions (Hannover Financing Arrangements) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
2013 Hannover Reinsurance Agreement [Member]      
Ceded Credit Risk [Line Items]      
Waived surrender charges on penalty free withdrawals and deaths on certain business, percentage 45.60%    
Reserve credit $ 638.1 $ 480.7  
Risk charges $ 27.7 21.0  
2011 Hannover Reinsurance Agreement [Member]      
Ceded Credit Risk [Line Items]      
Risk charge rate 1.25%    
Risk charges   0.3 $ 0.8
Net pretax statutory surplus benefit $ 49.2    
Reduction in pretax statutory surplus, current period   $ 10.3 $ 10.8