Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturity securities, amortized cost	$ 16,471,304,000	$ 13,755,858,000
Fixed maturity securities, allowance for credit loss	22,625,000	2,580,000
Financing receivable, allowance for credit loss	1,718,000	5,437,000
Premium receivable, allowance for credit loss	25,218,000	22,883,000
Uncollectible reinsurance	$ 7,712,903	$ 7,800,649
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.20	$ 0.20
Common stock, issued (in shares)	176,780,588	177,825,150
Common stock, outstanding (in shares)	176,780,588	177,825,150
Common stock, authorized (in shares)	750,000,000	750,000,000
Treasury stock, at cost (in shares)	175,895,912	174,851,350