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Fair Value of Financial Instruments - Other Investments - AVCT - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 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 | 3.00% |  | 3.00% |  | 3.00%
Beneficial ownership of all interests, percentage | 5.00% |  | 5.00% |  | 6.00%
Unrealized fair value measurement gains (losses), AVCT shares | $ (2.2) | $ 1.0 | $ (7.1) |  |
Unrealized gains (losses) on AVCT convertible debentures, before tax |  | 0.3 |  | $ 1.3 |
Unrealized gains (losses) on AVCT convertible debentures, net of tax |  | $ 0.2 |  | $ 1.0 |
AVCT | Common Stock |  |  |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Equity securities, fair value | $ 1.0 |  | $ 1.0 |  | $ 8.0

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