New Accounting Pronouncements (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Current assets
Prepaid expenses	$ 72.8		$ 62.0	$ 63.0
Total current assets	628.2		676.6	677.6
Property and equipment, net	5,155.2		5,297.1	6,868.8
Other assets
Goodwill	1,350.4		1,233.9	1,228.4
Operating lease right-of-use assets	4,592.0		3,806.5	0.0
Finance lease right-of-use assets	222.7		224.5	0.0
Total assets	14,318.0		13,424.8	10,961.0
Current liabilities
Current portion of financing obligations	45.3		50.1	67.8
Current portion of operating lease liabilities	124.4		102.3	0.0
Current portion of finance lease liabilities	6.3		5.8	0.0
Accrued expenses and other current liabilities	598.9		577.5	578.0
Total current liabilities	877.3		828.3	738.4
Long-term portion of financing obligations	4,110.8		4,144.2	7,080.6
Long-term portion of operating lease liabilities	4,439.1		3,704.4	0.0
Long-term portion of finance lease liabilities	217.8		218.3	0.0
Deferred income taxes	252.8		303.8	0.0
Other noncurrent liabilities	88.8		58.8	60.7
Total liabilities	12,378.6		11,607.9	10,229.8
Retained earnings (accumulated deficit)	254.1		117.7	(968.0)
Total Penn stockholders’ equity	1,939.8		1,816.9	731.2
Total stockholders’ equity	1,939.4	$ 1,891.7	1,816.9	731.2	$ 70.5	$ 27.7	$ (73.2)
Total liabilities and stockholders’ equity	$ 14,318.0		13,424.8	$ 10,961.0
ASC 842
Current assets
Prepaid expenses			(1.0)
Total current assets			(1.0)
Property and equipment, net			(1,571.7)
Other assets
Goodwill			5.5
Operating lease right-of-use assets			3,806.5
Finance lease right-of-use assets			224.5
Total assets			2,463.8
Current liabilities
Current portion of financing obligations			(17.7)
Current portion of operating lease liabilities			102.3
Current portion of finance lease liabilities			5.8
Accrued expenses and other current liabilities			(0.5)
Total current liabilities			89.9
Long-term portion of financing obligations			(2,936.4)
Long-term portion of operating lease liabilities			3,704.4
Long-term portion of finance lease liabilities			218.3
Deferred income taxes			303.8
Other noncurrent liabilities			(1.9)
Total liabilities			1,378.1
Retained earnings (accumulated deficit)			1,085.7
Total Penn stockholders’ equity			1,085.7
Total stockholders’ equity			1,085.7
Total liabilities and stockholders’ equity			2,463.8
Financing Obligations - Master Leases
Current assets
Prepaid expenses			0.0
Total current assets			0.0
Property and equipment, net			0.0
Other assets
Goodwill			5.5
Operating lease right-of-use assets			0.0
Finance lease right-of-use assets			0.0
Total assets			5.5
Current liabilities
Current portion of financing obligations			0.0
Current portion of operating lease liabilities			0.0
Current portion of finance lease liabilities			0.0
Accrued expenses and other current liabilities			0.0
Total current liabilities			0.0
Long-term portion of financing obligations			5.5
Long-term portion of operating lease liabilities			0.0
Long-term portion of finance lease liabilities			0.0
Deferred income taxes			0.0
Other noncurrent liabilities			0.0
Total liabilities			5.5
Retained earnings (accumulated deficit)			0.0
Total Penn stockholders’ equity			0.0
Total stockholders’ equity			0.0
Total liabilities and stockholders’ equity			5.5
Finance Leases - Dayton and Mahoning Valley
Current assets
Prepaid expenses			0.0
Total current assets			0.0
Property and equipment, net			(164.3)
Other assets
Goodwill			0.0
Operating lease right-of-use assets			0.0
Finance lease right-of-use assets			224.5
Total assets			60.2
Current liabilities
Current portion of financing obligations			(1.5)
Current portion of operating lease liabilities			0.0
Current portion of finance lease liabilities			5.8
Accrued expenses and other current liabilities			0.0
Total current liabilities			4.3
Long-term portion of financing obligations			(181.3)
Long-term portion of operating lease liabilities			0.0
Long-term portion of finance lease liabilities			218.3
Deferred income taxes			4.3
Other noncurrent liabilities			0.0
Total liabilities			45.6
Retained earnings (accumulated deficit)			14.6
Total Penn stockholders’ equity			14.6
Total stockholders’ equity			14.6
Total liabilities and stockholders’ equity			60.2
Operating Leases - Master Leases
Current assets
Prepaid expenses			0.0
Total current assets			0.0
Property and equipment, net			(1,407.4)
Other assets
Goodwill			0.0
Operating lease right-of-use assets			3,541.2
Finance lease right-of-use assets			0.0
Total assets			2,133.8
Current liabilities
Current portion of financing obligations			(16.2)
Current portion of operating lease liabilities			72.9
Current portion of finance lease liabilities			0.0
Accrued expenses and other current liabilities			0.0
Total current liabilities			56.7
Long-term portion of financing obligations			(2,760.6)
Long-term portion of operating lease liabilities			3,467.1
Long-term portion of finance lease liabilities			0.0
Deferred income taxes			299.5
Other noncurrent liabilities			0.0
Total liabilities			1,062.7
Retained earnings (accumulated deficit)			1,071.1
Total Penn stockholders’ equity			1,071.1
Total stockholders’ equity			1,071.1
Total liabilities and stockholders’ equity			2,133.8
Operating Lease - Meadows
Current assets
Prepaid expenses			0.0
Total current assets			0.0
Property and equipment, net			0.0
Other assets
Goodwill			0.0
Operating lease right-of-use assets			112.8
Finance lease right-of-use assets			0.0
Total assets			112.8
Current liabilities
Current portion of financing obligations			0.0
Current portion of operating lease liabilities			20.5
Current portion of finance lease liabilities			0.0
Accrued expenses and other current liabilities			0.0
Total current liabilities			20.5
Long-term portion of financing obligations			0.0
Long-term portion of operating lease liabilities			92.3
Long-term portion of finance lease liabilities			0.0
Deferred income taxes			0.0
Other noncurrent liabilities			0.0
Total liabilities			112.8
Retained earnings (accumulated deficit)			0.0
Total Penn stockholders’ equity			0.0
Total stockholders’ equity			0.0
Total liabilities and stockholders’ equity			112.8
Other Operating Leases - Non-Master Leases
Current assets
Prepaid expenses			(1.0)
Total current assets			(1.0)
Property and equipment, net			0.0
Other assets
Goodwill			0.0
Operating lease right-of-use assets			152.5
Finance lease right-of-use assets			0.0
Total assets			151.5
Current liabilities
Current portion of financing obligations			0.0
Current portion of operating lease liabilities			8.9
Current portion of finance lease liabilities			0.0
Accrued expenses and other current liabilities			(0.5)
Total current liabilities			8.4
Long-term portion of financing obligations			0.0
Long-term portion of operating lease liabilities			145.0
Long-term portion of finance lease liabilities			0.0
Deferred income taxes			0.0
Other noncurrent liabilities			(1.9)
Total liabilities			151.5
Retained earnings (accumulated deficit)			0.0
Total Penn stockholders’ equity			0.0
Total stockholders’ equity			0.0
Total liabilities and stockholders’ equity			$ 151.5