Investments - Narrative (Details) - security	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Number of fixed maturity and equity securities	360	139
Percentage of gross unrealized loss	100.00%	100.00%
Total fixed maturity securities | Investment grade
Debt Securities, Available-for-sale [Line Items]
Percentage of gross unrealized loss	77.50%	68.30%
Percentage of fair value	88.00%	81.80%