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Insurance Liabilities - Claim Duration and Payout Table (Details)
Dec. 31, 2017
Long-Term Disability/Group Life Waiver  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 7.20%
Year 2 22.80%
Year 3 13.80%
Year 4 7.90%
Year 5 5.90%
Year 6 5.20%
Year 7 4.30%
Year 8 4.10%
Year 9 3.70%
Year 10 3.00%
Dental/Vision/Short-Term Disability/Critical Illness  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 91.80%
Year 2 8.00%
Group Life  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 81.80%
Year 2 17.30%