Earnings per Share - Schedule of Antidilutive Securities and Reconciliation of Weighted-Average Common Shares Outstanding (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to PENN Entertainment, Inc.	$ (114.7)	$ 514.5
Net income applicable to preferred stock		1.7
Net income applicable to common stock	$ (114.7)	$ 512.8
Determination of shares:
Weighted-average common shares outstanding - basic (in shares)	151.9	153.3
Assumed conversion of convertible debt (in shares)	0.0	14.1
Weighted-average common shares outstanding - diluted (in shares)	151.9	168.6
Stock options
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.0	0.9
Restricted stock
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.0	0.3