Capital Stock and Share-Based Compensation Plans - Narrative (Details) $ / shares in Units, shares in Thousands		12 Months Ended
	Jan. 07, 2021 $ / shares shares	Dec. 31, 2024 USD ($) director classOfCommonShare shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2024 $ / shares
Class of Stock [Line Items]
Classes of common shares | classOfCommonShare		2
Number of directors as a percentage		33.33%
Share price | $ / shares					$ 3.14
Preferred stock dividends				$ 48,000,000
Undeclared cumulative dividends		$ 55,800,000
Redemption value of preferred stock		$ 688,000,000
Number of shares available for future stock compensation grants | shares		13,600
Maximum
Class of Stock [Line Items]
Minimum number of directors up for election, on which common shareholders entitled to vote | director		3
Preferred Stock | Berkshire Hathaway | ION Media
Class of Stock [Line Items]
Number of shares purchased | shares	6
Share price | $ / shares	$ 100,000
Preferred stock, redemption price, percent	105.00%
Preferred stock, dividend rate, percentage	8.00%
Preferred stock dividends			$ 48,000,000
Dividend rate if previous dividends are not paid in cash, as a percentage	9.00%
Number of warrants | shares	23,100
Exercise price of warrants | $ / shares	$ 13
Common stock, Class A
Class of Stock [Line Items]
Stock repurchased during period, value		$ 0	$ 0	$ 0
Restricted stock units
Class of Stock [Line Items]
Total unrecognized compensation cost related to restricted stock, RSUs and performance shares		$ 12,800,000
Weighted-average period of recognition, years		1 year 4 months 24 days
Restricted stock units | Minimum
Class of Stock [Line Items]
Vesting period of stock options		3 years
Restricted stock units | Maximum
Class of Stock [Line Items]
Vesting period of stock options		4 years