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Fair Value of Financial Instruments - Other Investments - AVCT - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Equity investment and warrants, amount paid $ 6.0   $ 6.0   $ 6.0
AVCT          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Equity investment ownership, percentage 1.00%   1.00%   3.00%
Beneficial ownership of all interests, percentage 1.00%   1.00%   6.00%
Unrealized fair value measurement gains (losses), AVCT shares $ (0.1) $ (7.6) $ (7.2) $ (7.6)  
Realized gain included in other income, net   0.7      
Unrealized gains (losses) on AVCT convertible debentures, before tax   (2.4)   (1.1)  
Unrealized gains (losses) on AVCT convertible debentures, net of tax   $ (1.8)   $ (0.8)  
AVCT | Common Stock          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Equity securities, fair value $ 1.0   $ 1.0   $ 8.0