Earnings per Share - 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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to PENN Entertainment	$ 26.1	$ 198.7	$ 77.8	$ 289.7
Net income applicable to preferred stock	0.1	1.0	0.3	1.5
Net income applicable to common stock	$ 26.0	$ 197.7	$ 77.5	$ 288.2
Determination of shares:
Weighted - average common shares outstanding (in shares)	164.8	156.0	166.5	155.8
Assumed conversion of convertible debt (in shares)	14.1	14.1	14.1	14.1
Weighted-average common shares outstanding - Diluted (in shares)	180.2	172.7	182.3	172.8
Stock options
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	1.1	2.2	1.4	2.4
Restricted stock
Determination of shares:
Assumed conversion of dilutive stock options and restricted stock (in shares)	0.2	0.4	0.3	0.5