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Fair Value of Financial Instruments - Other Investments - AVCT - Narrative (Details) - AVCT - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Equity investment ownership, percentage 3.00%   3.00%
Beneficial ownership of all interests, percentage 5.00%   6.00%
Equity investment and warrants, amount paid $ 6.0   $ 6.0
Unrealized fair value measurement gains (losses), AVCT shares (4.8) $ (1.0)  
Unrealized gains (losses) on AVCT convertible debentures, before tax   1.0  
Unrealized gains (losses) on AVCT convertible debentures, net of tax   $ 0.8  
Common Stock      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Equity securities, fair value $ 3.0   $ 8.0