XML 60 R48.htm IDEA: XBRL DOCUMENT v3.21.2
Fair Value of Financial Instruments - Other Investments - AVCT - Narrative (Details) - AVCT - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Equity investment ownership, percentage 5.00%   5.00%   9.00%
Beneficial ownership of all interests, percentage 8.00%   8.00%   21.00%
Equity investment and warrants, amount paid (in dollars) $ 6.0   $ 6.0   $ 5.0
Unrealized fair value measurement gains (losses), AVCT shares (7.6) $ 0.9 (7.6) $ 4.7  
Reclassified gains (losses) on AVCT convertible debentures 0.7        
Unrealized gains (losses) on AVCT convertible debentures, before tax (2.4) 0.9 (1.1) 0.9  
Unrealized gains (losses) on AVCT convertible debentures, net of tax (1.8) $ 0.7 (0.8) $ 0.7  
Common Stock          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Equity securities, fair value $ 9.0   $ 9.0   $ 17.0