Investments in and Advances to Unconsolidated Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Return on investment from unconsolidated affiliates	$ 29.0	$ 27.0	$ 26.5
Summary financial information
Net income attributable to Penn National	$ 28.4	$ 22.3	18.7
Kansas Entertainment
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%	50.00%
Investment balance	$ 90.8	$ 89.4
Return on investment from unconsolidated affiliates	29.0	27.0	26.0
Summary financial information
Current assets	21.5	18.3
Long-term assets	159.2	161.0
Current liabilities	13.5	15.1
Revenues	162.3	159.0	155.7
Operating expenses	101.3	110.4	114.7
Operating income	61.0	48.6	41.0
Net income	61.0	48.6	41.0
Net income attributable to Penn National	$ 30.5	$ 24.3	$ 20.5
Freehold Raceway
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
MAXXAM
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%