Investment in Life Insurance Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Benefits recognized from insurance policies	$ 39.8	$ 27.5	$ 105.2	$ 80.9
Carrying value of life insurance policies	13.5	6.6	32.3	20.7
Realized gains from life insurance policies	$ 26.3	$ 20.8	$ 72.9	$ 60.2
Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate applied to portfolio	8.25%		8.25%		8.25%