Stockholders' Equity (Details) - USD ($)		3 Months Ended			9 Months Ended
	Jan. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Dividends Payable [Line Items]
Dividends					$ 0	$ 0
NWLIC
Dividends Payable [Line Items]
Maximum dividend payment which may be paid without prior approval		$ 152,800,000			152,800,000
Dividends			$ 4,000,000.0	$ 32,000,000.0
Ozark National Life Insurance Company
Dividends Payable [Line Items]
Maximum dividend payment which may be paid without prior approval		17,200,000			$ 17,200,000
Extraordinary dividend paid	$ 102,700,000
Class A
Dividends Payable [Line Items]
Percent of Board of Directors elected					33.33%
Dividends		0	0		$ 0	0
Class B
Dividends Payable [Line Items]
Dividends in kind paid to common stockholders compare to other classes					50.00%
Dividends		$ 0	$ 0		$ 0	$ 0
Class B | Board of Directors Chairman
Dividends Payable [Line Items]
Common stock, percentage ownership		99.00%			99.00%