CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Total Penn National Gaming, Inc. Stockholders’ Equity (Deficit)	Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2017		0	91,225,242
Beginning balance at Dec. 31, 2017	$ (73.2)	$ 0.0	$ 0.9	$ (28.4)	$ 1,007.6	$ (1,051.8)	$ (1.5)	$ (73.2)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation arrangements (in shares)			1,202,384
Share-based compensation arrangements	16.3				16.3			16.3
Reclassification of accumulated other comprehensive loss to earnings upon termination of management contract	1.5						1.5	1.5
Net income	135.5					135.5		135.5
Ending balance (in shares) at Sep. 30, 2018		0	92,427,626
Ending balance at Sep. 30, 2018	70.5	$ 0.0	$ 0.9	(28.4)	1,023.9	(925.9)	0.0	70.5	0.0
Beginning balance (in shares) at Jun. 30, 2018		0	92,196,285
Beginning balance at Jun. 30, 2018	27.7	$ 0.0	$ 0.9	(28.4)	1,018.7	(962.0)	(1.5)	27.7	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation arrangements	5.2				5.2			5.2
Reclassification of accumulated other comprehensive loss to earnings upon termination of management contract	1.5						1.5	1.5
Net income	36.1					36.1		36.1
Ending balance (in shares) at Sep. 30, 2018		0	92,427,626
Ending balance at Sep. 30, 2018	70.5	$ 0.0	$ 0.9	(28.4)	1,023.9	(925.9)	0.0	70.5	0.0
Beginning balance (in shares) at Dec. 31, 2018		0	116,687,808
Beginning balance at Dec. 31, 2018	731.2	$ 0.0	$ 1.2	(28.4)	1,726.4	(968.0)	0.0	731.2	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	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	0.0	1,939.8	(0.4)
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	0.0	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	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	$ 0.0	$ 1,939.8	$ (0.4)