Earnings (Loss) per Share - Reconciliation of Weighted-Average Common Shares Outstanding (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income (Loss) Attributable to Parent, Diluted [Abstract]
Net income attributable to PENN Entertainment, Inc.	$ (311.5)	$ (490.0)	$ 222.1
Net income applicable to preferred stock			0.9
Net income (loss) applicable to common stock	$ (311.5)	$ (490.0)	$ 221.2
Determination of shares:
Weighted-average common shares outstanding - basic (in shares)	152.1	152.1	161.2
Assumed conversion of convertible debt (in shares)			14.1
Weighted-average common shares outstanding—diluted (in shares)	152.1	152.1	176.6
Stock options
Determination of shares:
Assumed conversion of dilutive employee stock-based awards and restricted stock (in shares)			1.2
Restricted stock
Determination of shares:
Assumed conversion of dilutive employee stock-based awards and restricted stock (in shares)			0.1