Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	May 17, 2017
Loss Contingencies [Line Items]
Total costs to remediate IRC Section 7702 issue	$ 10.0	$ 12.3
Toll charges and fees to remediate IRC Section 7702 issue	9.1
Cost of claim and reserve liabilities to remediate IRC Section 7702 issue	0.9
Decrease in total cost to remediate Section 7702 and 72(s) issue during the period	2.3
Minimum [Member]
Loss Contingencies [Line Items]
Cost Range to Remediate IRC Section 7702 Issue	6.0
Minimum [Member] | IRC Section 7702 remediation costs [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss	0.6
Maximum [Member]
Loss Contingencies [Line Items]
Cost Range to Remediate IRC Section 7702 Issue	52.5
Maximum [Member] | IRC Section 7702 remediation costs [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss	$ 0.9
CICA Life Insurance Company of America [Member]
Loss Contingencies [Line Items]
Toll Charges, Domestic Life Business			$ 0.0
CNLIC subsidiary of CICA [Member] [Domain]
Loss Contingencies [Line Items]
Toll Charges, Domestic Life Business			$ 0.0