Investment in Life Insurance Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Benefits recognized from insurance policies	$ 39.9	$ 23.0	$ 65.4	$ 53.5
Carrying value of life insurance policies	12.8	5.3	18.8	14.0
Realized gains from life insurance policies	$ 27.1	$ 17.7	$ 46.6	$ 39.4
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%