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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to PENN Entertainment, Inc.	$ (26.8)	$ 78.4	$ (141.5)	$ 592.9
Net income applicable to preferred stock		0.2		1.7
Net income applicable to common stock	$ (26.8)	$ 78.2	$ (141.5)	$ 591.2
Determination of shares:
Weighted-average common shares outstanding - basic (in shares)	152.1	152.8	152.0	153.0
Assumed conversion of convertible debt (in shares)	0.0	14.1	0.0	14.1
Weighted-average common shares outstanding - diluted (in shares)	152.1	167.9	152.0	168.2
Stock options
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.0	0.7	0.0	0.8
Restricted stock
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.0	0.3	0.0	0.3