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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss) attributable to PENN Entertainment	$ (724.8)	$ 123.5	$ (131.9)	$ 201.3
Net income applicable to preferred stock	0.0	0.5	0.0	0.8
Net income (loss) applicable to common stock	$ (724.8)	$ 123.0	$ (131.9)	$ 200.5
Determination of shares:
Weighted average common shares outstanding - basic (in shares)	150.9	157.6	152.3	163.5
Convertible debt (in shares)	0.0	14.1	0.0	14.1
Weighted-average common shares outstanding - diluted (in shares)	150.9	173.0	152.3	179.0
Stock options
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.0	1.0	0.0	1.2
Restricted stock
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.0	0.3	0.0	0.2