Fair Value Measurements - Additional Information (Details) $ in Millions	Mar. 31, 2020 USD ($)	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impact on portfolio due to change in valuation technique	$ 5.0
Compensation percent	2.65%
Measurement Input, Mortality Rate | Male
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1	1.10
Measurement Input, Mortality Rate | Female
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.90	0.90
Measurement Input, Mortality Rate | Regardless of Gender
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	3.50	3.50