CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock	Common Stock	Treasury Stock	Addi- tional Paid-In Capital	Retained Earnings (Accum- ulated Deficit)	Retained Earnings (Accum- ulated Deficit) Cumulative Effect, Period of Adoption, Adjustment	Total Penn National Stock- holders’ Equity	Total Penn National Stock- holders’ Equity Cumulative Effect, Period of Adoption, Adjustment	Non-Control- ling Interest
Beginning balance (in shares) at Dec. 31, 2018			0	116,687,808
Beginning balance at Dec. 31, 2018	$ 731.2	$ 1,085.7	$ 0.0	$ 1.2	$ (28.4)	$ 1,726.4	$ (968.0)	$ 1,085.7	$ 731.2	$ 1,085.7	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation arrangements (in shares)				461,280
Share-based compensation arrangements	11.4					11.4			11.4
Share repurchases (in shares)				(1,271,823)
Share repurchases	(24.9)					(24.9)			(24.9)
Net income (loss)	136.0						136.4		136.4		(0.4)
Ending balance (in shares) at Sep. 30, 2019			0	115,877,265
Ending balance at Sep. 30, 2019	$ 1,939.4		$ 0.0	$ 1.2	(28.4)	1,712.9	254.1		1,939.8		(0.4)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Dec. 31, 2018			0	116,687,808
Beginning balance at Dec. 31, 2018	$ 731.2	1,085.7	$ 0.0	$ 1.2	(28.4)	1,726.4	(968.0)	1,085.7	731.2	1,085.7	0.0
Ending balance (in shares) at Dec. 31, 2019			0	115,958,259
Ending balance at Dec. 31, 2019	1,851.9	0.6	$ 0.0	$ 1.2	(28.4)	1,718.3	161.6	0.6	1,852.7	0.6	(0.8)
Beginning balance (in shares) at Jun. 30, 2019			0	115,869,769
Beginning balance at Jun. 30, 2019	1,891.7		$ 0.0	$ 1.2	(28.4)	1,708.9	210.2		1,891.9		(0.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation arrangements (in shares)				7,496
Share-based compensation arrangements	4.0					4.0			4.0
Net income (loss)	43.7						43.9		43.9		(0.2)
Ending balance (in shares) at Sep. 30, 2019			0	115,877,265
Ending balance at Sep. 30, 2019	$ 1,939.4		$ 0.0	$ 1.2	(28.4)	1,712.9	254.1		1,939.8		(0.4)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Dec. 31, 2019			0	115,958,259
Beginning balance at Dec. 31, 2019	$ 1,851.9	$ 0.6	$ 0.0	$ 1.2	(28.4)	1,718.3	161.6	$ 0.6	1,852.7	$ 0.6	(0.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation arrangements (in shares)				4,028,992
Share-based compensation arrangements	61.0					61.0			61.0
Common stock offering (Note 14) (in shares)				35,266,667
Common stock offering (Note 15)	1,288.8			$ 0.4		1,288.4			1,288.8
Convertible debt offering (Note 10)	$ 88.2					88.2			88.2
Barstool Sports investment (Note 12) (in shares)	883
Barstool Sports investment (Note 12)	$ 23.1		$ 23.1						23.1
Net income (loss)	(681.8)						(680.6)		(680.6)		(1.2)
Other	(0.1)					(0.1)			(0.1)
Ending balance (in shares) at Sep. 30, 2020			883	155,253,918
Ending balance at Sep. 30, 2020	2,631.7		$ 23.1	$ 1.6	(28.4)	3,155.8	(518.4)		2,633.7		(2.0)
Beginning balance (in shares) at Jun. 30, 2020			883	137,435,090
Beginning balance at Jun. 30, 2020	1,504.9		$ 23.1	$ 1.4	(28.4)	2,170.4	(660.3)		1,506.2		(1.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation arrangements (in shares)				1,718,828
Share-based compensation arrangements	28.3					28.3			28.3
Common stock offering (Note 14) (in shares)				16,100,000
Common stock offering (Note 15)	957.6			$ 0.2		957.4			957.6
Net income (loss)	141.2						141.9		141.9		(0.7)
Other	(0.3)					(0.3)			(0.3)
Ending balance (in shares) at Sep. 30, 2020			883	155,253,918
Ending balance at Sep. 30, 2020	$ 2,631.7		$ 23.1	$ 1.6	$ (28.4)	$ 3,155.8	$ (518.4)		$ 2,633.7		$ (2.0)