FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Oct. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
FAIR VALUE MEASUREMENTS:
Investments in equity securities measured at fair value		$ 132.0				$ 228.0
Debt discount and deferred financing costs		$ 56.0				36.0
Bally's
FAIR VALUE MEASUREMENTS:
Option purchase price, minimum (in dollars per share)		$ 30
Option purchase price, maximum (in dollars per share)		$ 45
Bally's | Options and Warrants
FAIR VALUE MEASUREMENTS:
Measurement adjustments	$ 18.0	$ (8.0)	$ 10.0
Interest Rate Swap
FAIR VALUE MEASUREMENTS:
Derivative liability		$ 0.1
Derivative asset						1.0
STG Second Lien Secured Notes 9.750 Percent Due 2033 | Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		9.75%
STG Senior Unsecured Notes 8.125 Percent Due 2027 | Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		8.125%
5.500% Senior Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.50%
STG 5.125% Senior Notes | Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.125%
Debt instrument, repurchased aggregate principal amount					$ 81.0
STG 5.125% Senior Notes | Senior Notes | Subsequent Event
FAIR VALUE MEASUREMENTS:
Debt instrument, repurchased aggregate principal amount				$ 89.0
STG Second-Out First Lien Secured Notes 4.375 Percent due 2032 | Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		4.375%
4.125% Senior Secured Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		4.125%
STG 4.125% Unsecured Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		4.125%
Term Loan B-2, due September 30, 2026 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt instrument, repurchased aggregate principal amount	27.0		27.0
Level 1 | Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities measured at fair value		$ 0.0				19.0
Deferred compensation assets		51.0				47.0
Deferred compensation liabilities		47.0				46.0
Level 1 | Fair Value | Money market funds
FAIR VALUE MEASUREMENTS:
Money market funds		378.0				601.0
Level 2 | Face Value | STG Second Lien Secured Notes 9.750 Percent Due 2033 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		432.0				0.0
Level 2 | Face Value | STG Senior Unsecured Notes 8.125 Percent Due 2027 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,430.0				0.0
Level 2 | Face Value | 5.500% Senior Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		485.0				485.0
Level 2 | Face Value | STG 5.125% Senior Notes | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		89.0				274.0
Level 2 | Face Value | STG Second-Out First Lien Secured Notes 4.375 Percent due 2032 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		238.0				0.0
Level 2 | Face Value | 4.125% Senior Secured Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		0.0				737.0
Level 2 | Face Value | STG 4.125% Unsecured Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		4.0				0.0
Level 2 | Face Value | Term Loan B-2, due September 30, 2026 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		0.0				1,175.0
Level 2 | Face Value | Term Loan B-3, due April 1, 2028 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		3.0				714.0
Level 2 | Face Value | Term Loan B-4, due April 21, 2029 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		0.0				731.0
Level 2 | Face Value | Term Loan B-6, due December 31, 2029 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		708.0				0.0
Level 2 | Face Value | Term Loan B-7, due December 31, 2030 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		728.0				0.0
Level 2 | Face Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		6.0				7.0
Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities measured at fair value		130.0				141.0
Level 2 | Fair Value | STG Second Lien Secured Notes 9.750 Percent Due 2033 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		472.0				0.0
Level 2 | Fair Value | STG Senior Unsecured Notes 8.125 Percent Due 2027 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,472.0				0.0
Level 2 | Fair Value | 5.500% Senior Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		415.0				328.0
Level 2 | Fair Value | STG 5.125% Senior Notes | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		89.0				249.0
Level 2 | Fair Value | STG Second-Out First Lien Secured Notes 4.375 Percent due 2032 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		171.0				0.0
Level 2 | Fair Value | 4.125% Senior Secured Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		0.0				546.0
Level 2 | Fair Value | STG 4.125% Unsecured Notes due 2030 | Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		3.0				0.0
Level 2 | Fair Value | Term Loan B-2, due September 30, 2026 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		0.0				1,160.0
Level 2 | Fair Value | Term Loan B-3, due April 1, 2028 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		2.0				575.0
Level 2 | Fair Value | Term Loan B-4, due April 21, 2029 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		0.0				589.0
Level 2 | Fair Value | Term Loan B-6, due December 31, 2029 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		630.0				0.0
Level 2 | Fair Value | Term Loan B-7, due December 31, 2030 | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		648.0				0.0
Level 2 | Fair Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		6.0				7.0
Level 2 | Fair Value | Interest Rate Swap
FAIR VALUE MEASUREMENTS:
Derivative liability		0.0
Derivative asset						1.0
Level 3 | Face Value | Options and Warrants
FAIR VALUE MEASUREMENTS:
Measurement adjustments	$ 16.0	(8.0)	$ 12.0
Level 3 | Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities measured at fair value		$ 2.0				$ 68.0