Earnings (Loss) per Share - Reconciliation of Weighted-Average Common Shares Outstanding (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Income (Loss) Attributable to Parent, Diluted [Abstract]
Net income (loss) attributable to PENN Entertainment	$ 222.1	$ 420.8	$ (669.5)
Net income applicable to preferred stock	0.9	2.1	0.0
Net income (loss) applicable to common stock	$ 221.2	$ 418.7	$ (669.5)
Determination of shares:
Weighted-average common shares outstanding - basic (in shares)	161.2	158.7	134.0
Assumed conversion of convertible debt (in shares)	14.1	14.1	0.0
Weighted-average common shares outstanding—Diluted (in shares)	176.6	175.5	134.0
Stock options
Determination of shares:
Assumed conversion of dilutive employee stock-based awards and restricted stock (in shares)	1.2	2.3	0.0
Restricted stock
Determination of shares:
Assumed conversion of dilutive employee stock-based awards and restricted stock (in shares)	0.1	0.4	0.0