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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to PENN Entertainment	$ 78.4	$ 26.1	$ 592.9	$ 77.8
Net income applicable to preferred stock	0.2	0.1	1.7	0.3
Net income applicable to common stock	$ 78.2	$ 26.0	$ 591.2	$ 77.5
Determination of shares:
Weighted - average common shares outstanding (in shares)	152.8	164.8	153.0	166.5
Assumed conversion of convertible debt (in shares)	14.1	14.1	14.1	14.1
Weighted-average common shares outstanding - Diluted (in shares)	167.9	180.2	168.2	182.3
Stock options
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.7	1.1	0.8	1.4
Restricted stock
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.3	0.2	0.3	0.3