Earnings per Share - 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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to PENN Entertainment	$ 123.5	$ 86.1	$ 201.3	$ 375.8
Net income applicable to preferred stock	0.5	0.4	0.8	1.9
Net income applicable to common stock	$ 123.0	$ 85.7	$ 200.5	$ 373.9
Determination of shares:
Weighted - average common shares outstanding (in shares)	157.6	156.1	163.5	155.9
Assumed conversion of convertible debt (in shares)	14.1	14.1	14.1	14.1
Weighted-average common shares outstanding - Diluted (in shares)	173.0	172.7	179.0	172.7
Stock options
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	1.0	2.1	1.2	2.3
Restricted stock
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.3	0.4	0.2	0.4