Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies - Summary of Amortization Basis and Expected Amortization Period by Reportable Segment (Details)	12 Months Ended
	Dec. 31, 2024
Life Insurance
Product Information [Line Items]
Traditional contract acquisition cost amortization period	60 years
Group Protection
Product Information [Line Items]
Traditional contract acquisition cost amortization period	4 years
Retirement Plan Services
Product Information [Line Items]
Traditional contract acquisition cost amortization period	40 years