Fair Value Measurements - Narrative (Details)	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Compensating percent	2.65%
Measurement Input, Discount Rate | 21 Months
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Measurement input	0.25
Measurement Input, Discount Rate | 24 to 26 Months
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Measurement input	0.50
Measurement Input, Discount Rate | 27 to 29 Months
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Measurement input	0.75
Measurement Input, Mortality Rate | Male
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Measurement input	1.10
Measurement Input, Mortality Rate | Female
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Measurement input	0.90
Measurement Input, Mortality Rate | Regardless Of Gender
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Measurement input	3.50