Summary of Significant Accounting Policies - Consolidated VIEs (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 204.1	$ 190.9
Accounts receivable, net		1,079.4	1,021.0
Prepaid expenses and other current assets		121.4	138.8
Total current assets		1,614.5	1,412.7
Property and equipment, net		1,262.4	1,512.5
Goodwill		2,960.8	3,051.6	$ 2,960.8
FCC licenses		2,910.3	2,910.3
Intangible assets, net		2,434.2	2,717.1
Other noncurrent assets, net		377.7	396.2
Total assets	[1]	12,678.9	13,264.5
Current liabilities:
Current portion of debt		124.3	47.2
Interest payable		55.8	62.3
Other current liabilities		51.1	56.3
Total current liabilities		893.2	787.3
Debt		6,827.2	7,367.9
Deferred tax liabilities		1,605.6	1,728.5
Other noncurrent liabilities		583.6	523.3
Total liabilities	[1]	9,909.6	10,407.0
Network affiliation agreements [Member]
Current assets:
Intangible assets, net		1,871.4	2,060.2
Other definite-lived intangible assets [Member]
Current assets:
Intangible assets, net		562.8	656.9
Consolidated VIEs [Member]
Current assets:
Cash and cash equivalents		6.4	9.2
Accounts receivable, net		26.0	21.1
Prepaid expenses and other current assets		5.5	10.3
Total current assets		37.9	40.6
Property and equipment, net		58.8	57.5
Goodwill		150.5	150.5
FCC licenses		200.4	200.4
Other noncurrent assets, net		80.2	85.7
Total assets		604.2	619.6
Current liabilities:
Current portion of debt		3.0	3.0
Interest payable		30.4	34.4
Total current liabilities		33.4	37.4
Debt		352.8	355.5
Deferred tax liabilities		34.8	41.8
Other noncurrent liabilities		84.9	92.6
Total liabilities		505.9	527.3
Consolidated VIEs [Member] | Network affiliation agreements [Member]
Current assets:
Intangible assets, net		76.4	84.9
Non Guarantor VIEs [Member]
Current assets:
Total current assets		4.1	5.1
Property and equipment, net		11.3	12.2
Goodwill		62.2	62.2
FCC licenses		200.4	200.4
Other noncurrent assets, net		1.4	1.3
Total assets		304.8	309.7
Current liabilities:
Total current liabilities		28.7	33.7
Noncurrent liabilities		119.7	134.3
Total liabilities		148.4	168.0
Non Guarantor VIEs [Member] | Network affiliation agreements [Member]
Current assets:
Intangible assets, net		$ 25.4	$ 28.5

[1] The consolidated total assets as of December 31, 2022 and 2021 include certain assets held by consolidated VIEs of $304.8 million and $309.7 million, respectively, which are not available to be used to settle the obligations of Nexstar. The consolidated total liabilities as of December 31, 2022 and 2021 include certain liabilities of consolidated VIEs of $148.4 million and $168.0 million, respectively, for which the creditors of the VIEs have no recourse to the general credit of Nexstar. See Note 2 for additional information.