v3.22.2.2
Investments - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]          
Allowance for credit loss, available-for-sale debt securities $ 0   $ 0   $ 0
Debt securities in an unrealized loss position 767,800,000   767,800,000   801,500,000
Debt securities, unrealized loss     14,400,000   3,500,000
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 29,900,000   29,900,000    
Realized gain (loss) on marketable equity securities   $ 900,000   $ (13,400,000)  
Equity securities without readily determinable fair value, carrying value 75,000,000   75,000,000   75,000,000
Cumulative downward adjustments for observable price changes and impairment 56,200,000   56,200,000   56,200,000
Carrying value of equity method investments 14,500,000   14,500,000   $ 17,400,000
Unrealized gain (loss) on marketable equity securities (1,400,000) (1,300,000) (4,200,000) (2,200,000)  
Impairment in equity method investments $ 0 $ 0 $ 0 $ 0