Fair Value Measurements - Schedule of Estimated Fair Values and Carrying Amounts of Long-term Debt Not Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due October 2023 [Member] | Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]		$ 484.3
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due October 2023 [Member] | Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]		483.8
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due September 2024 [Member] | Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]		599.3
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due September 2024 [Member] | Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]		602.0
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due June 2027 [Member] | Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]	$ 2,356.1
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due June 2027 [Member] | Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]	2,275.3
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due January 2024 [Member] | Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]		589.4
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due January 2024 [Member] | Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]		593.5
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due September 2026 [Member] | Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]	1,528.7	2,601.5
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due September 2026 [Member] | Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]	1,554.7	2,638.5
Nexstar [Member] | Senior Subordinated Notes [Member] | 5.625% Notes, due July 2027 [Member] | Level 2 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[2]	1,718.0	1,790.2
Nexstar [Member] | Senior Subordinated Notes [Member] | 5.625% Notes, due July 2027 [Member] | Level 2 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[2]	1,619.6	1,880.4
Nexstar [Member] | Senior Subordinated Notes [Member] | 4.75% Notes, due November 2028 [Member] | Level 2 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[2]	992.9	991.9
Nexstar [Member] | Senior Subordinated Notes [Member] | 4.75% Notes, due November 2028 [Member] | Level 2 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[2]	880.0	1,022.3
Mission [Member] | Secured Debt [Member] | Term Loan B, due June 2028 [Member] | Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]	294.3	297.0
Mission [Member] | Secured Debt [Member] | Term Loan B, due June 2028 [Member] | Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]	291.2	299.7
Mission [Member] | Secured Debt [Member] | Revolving loans, due June 2027 [Member] | Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]	61.5
Mission [Member] | Secured Debt [Member] | Revolving loans, due June 2027 [Member] | Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]	$ 59.6
Mission [Member] | Secured Debt [Member] | Revolving loans, due October 2023 [Member] | Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]		61.5
Mission [Member] | Secured Debt [Member] | Revolving loans, due October 2023 [Member] | Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Amount and Fair Value of Long-term Debt	[1]		$ 61.2

[1] The fair values of senior secured and revolving credit facilities are computed based on borrowing rates currently available to the Company for bank loans with similar terms and average maturities. These fair value measurements are considered Level 3, as significant inputs to the fair value calculation are unobservable in the market. See Note 8 for information on changes in the carrying amounts of debt during 2022.

[2] The fair value of the Company’s fixed rate debt is estimated based on bid prices obtained from an investment banking firm that regularly makes a market for these financial instruments. These fair value measurements are considered Level 2, as quoted market prices are available for low volume trading of these securities. See Note 8 for information on changes in the carrying amounts of debt during 2022.