Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]: Short-duration Insurance Contracts, Schedule of Historical Claims Duration (Details)	Dec. 31, 2017
Specialty Health Segment Member
Short-duration Insurance Contracts, Historical Claims Duration, Year One	64.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	27.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	0.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.00%
Group disability, life and DBL Segment Member | Group Disability Product Line
Short-duration Insurance Contracts, Historical Claims Duration, Year One	18.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	22.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	7.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	2.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.40%