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Income Taxes - Effective Tax Rate Reconciliation and Pretax Income (Loss) and Revenue by Tax Jurisdiction (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pre-tax Income Taxes and Revenue [Line Items]
Expected tax provision (benefit)	$ 20	$ 14
Tax-exempt interest	(3)	(3)
NCI	(3)	(2)
State taxes	3	4
Foreign taxes	5	1
Stock based compensation	1	2
Other	0	2
Total provision (benefit) for income taxes	$ 23	$ 18
Effective tax rate	19.10%	20.00%
Pretax income (loss)	$ 120	$ 93
Revenues	283	300
United States
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	108	84
Revenues	235	269
Bermuda
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	25	27
Revenues	35	33
U.K.
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(11)	(14)
Revenues	13	0
Other
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(2)	(4)
Revenues	$ 0	$ (2)

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