Bankruptcy (Details) $ in Millions						2 Months Ended	12 Months Ended
	Sep. 02, 2021 USD ($)	Mar. 19, 2021 USD ($)	Mar. 10, 2021	Oct. 12, 2020	Oct. 11, 2020 USD ($)	Dec. 25, 2020 USD ($) numberOfPlaintiffs	Dec. 31, 2021 USD ($) action	Dec. 25, 2020 USD ($)	Dec. 27, 2019 USD ($)	Mar. 11, 2021 USD ($)	Nov. 05, 2019	Aug. 31, 2014 USD ($)	Apr. 30, 2013 USD ($)
Reorganizations [Line Items]
Restructuring Support Agreement, MSGE Support Group | numberOfPlaintiffs						1,300
Restructuring Support Agreement, Common Stock Share Percentage Reorganized New Company					100.00%
Restruring Support Agreement, Proposed Settlement of General Unsecured Claims	$ 135.0
Non-Debtor Intercompany Receivables						$ 282.3	$ 119.1	$ 282.3
Non-Debtor Intercompany Payables						120.3	112.9	120.3
Cash paid for interest							243.2	256.1	$ 314.2
Accrued interest						26.9	$ 17.0	26.9
Bankruptcy Claims, Number Claims Filed | action							50,000
Debentures | Restructuring Support Agreement [Member]
Reorganizations [Line Items]
Holders of Principal Debt, Percentage					84.00%
Secured Debt
Reorganizations [Line Items]
Restructuring Support Agreement, Proposed Long-Term Debt					$ 375.0
Restructuring Support Agreement, Proposed Debt, Term					7 years
Interest Protection Payment, Expense							$ 63.1	11.7
Debt Instrument, Interest Rate, Increase (Decrease)				200.00%
Interest Protection Payment, Paid							$ 66.7	7.8
5.75% senior notes due August 2022 | Senior Notes
Reorganizations [Line Items]
Stated interest rate							5.75%					5.75%
Debt instrument, face amount												$ 900.0
5.75% senior notes due August 2022 | Senior Notes | Fair Value, Inputs, Level 1 [Member]
Reorganizations [Line Items]
Stated interest rate							5.75%
Five Point Six Two Five Percent Note | Debentures
Reorganizations [Line Items]
Stated interest rate							5.625%
Five Point Six Two Five Percent Note | Debentures | Fair Value, Inputs, Level 1 [Member]
Reorganizations [Line Items]
Stated interest rate							5.625%
Five Point Five Percent Notes [Member] | Senior Notes
Reorganizations [Line Items]
Stated interest rate							5.50%
Five Point Five Percent Notes [Member] | Debentures | Fair Value, Inputs, Level 1 [Member]
Reorganizations [Line Items]
Stated interest rate							5.50%
9.50% debentures due May 2022 | Debentures
Reorganizations [Line Items]
Stated interest rate							9.50%
8.00% debentures due March 2023 | Debentures
Reorganizations [Line Items]
Stated interest rate							8.00%
4.75% senior notes due April 2023 | Senior Notes
Reorganizations [Line Items]
Stated interest rate							4.75%						4.75%
Debt instrument, face amount													$ 600.0
4.75% senior notes due April 2023 | Senior Notes | Fair Value, Inputs, Level 1 [Member]
Reorganizations [Line Items]
Stated interest rate							4.75%
Debentures
Reorganizations [Line Items]
Accrued interest						$ 28.8	$ 93.0	$ 28.8
Ten Point Zero Percent Second Lien Notes [Member] | Senior Notes
Reorganizations [Line Items]
Stated interest rate							10.00%
Ten Point Zero Percent Second Lien Notes [Member] | Senior Notes | Fair Value, Inputs, Level 1 [Member]
Reorganizations [Line Items]
Stated interest rate							10.00%
Ten Point Zero Percent Second Lien Notes [Member] | Secured Debt
Reorganizations [Line Items]
Stated interest rate											10.00%
Term Loans due Sept 2024 and Feb 2025 [Member]
Reorganizations [Line Items]
Repayments of Long-term Debt		$ 114.0
Proposed Debt Instrument Term			5 years 9 months
Term Loans due Sept 2024 and Feb 2025 [Member] | Restructuring Support Agreement [Member]
Reorganizations [Line Items]
Ad Hoc Lender Aggregate Principal Amount										$ 1,300.0
Term Loan and New Term Loan | Secured Debt
Reorganizations [Line Items]
Proposed Debt Instrument Basis Spread On Variable Rate			5.25%
Term Loan due 2025 [Member] | Secured Debt
Reorganizations [Line Items]
Proposed Debt Instrument Basis Spread On Variable Rate			5.50%
Maximum
Reorganizations [Line Items]
Remedial cost, estimate							$ 120.9
Opioid Claimant Trust [Member]
Reorganizations [Line Items]
Restructuring Support Agreement ProposedSettlement, Payment Year One and Two					$ 200.0
Restructuring Support Agreement Proposed Settlement, Upfront Payment					450.0
Restructuring Support Agreement, Equity Value of Reorganized Debtors					1,551.0
PlanofReorganizationProposedPlanSettlement					1,725.0
Litigation Settlement, Amount Awarded to Other Party, Post Closing Settlement Amount, Year Three through Seven					150.0
Restructuring Support Agreement Proposed Settlement, Year Eight	125.0
Opioid Claimant Trust [Member] | Restructuring Support Agreement [Member]
Reorganizations [Line Items]
Litigation Settlement, Amount Awarded to Other Party, Post Closing Settlement Amount, Year Three through Seven					$ 150.0
Restructuring Support Agreement Proposed Settlement, Year Eight	$ 125.0
Opioid Claimant Trust [Member] | Ownership Interest [Member]
Reorganizations [Line Items]
Restructuring Support Agreement, Warrants Common Stock Share Percentage					19.99%
Medicaid Lawsuit [Member]
Reorganizations [Line Items]
PlanofReorganizationProposedPlanSettlement					$ 260.0
Restructuring Support Agreement, Proposed Debt, Term					7 years
Medicaid Lawsuit [Member] | Maximum
Reorganizations [Line Items]
Remedial cost, estimate					$ 640.0