New Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current assets
Prepaid expenses	$ 76.7	$ 62.0	$ 63.0
Total current assets	642.8	676.6	677.6
Property and equipment, net	5,120.2	5,297.1	6,868.8
Other assets
Goodwill	1,270.7	1,233.9	1,228.4	$ 1,008.1
Operating lease right-of-use assets	4,613.3	3,806.5	0.0
Finance lease right-of-use assets	224.0	224.5	0.0
Total assets	14,194.5	13,424.8	10,961.0	5,234.8
Current liabilities
Current portion of financing obligations	40.5	50.1	67.8
Current portion of operating lease liabilities	124.1	102.3	0.0
Current portion of finance lease liabilities	6.5	5.8	0.0
Accrued expenses and other current liabilities	631.3	577.5	578.0
Total current liabilities	905.6	828.3	738.4
Long-term portion of financing obligations	4,102.2	4,144.2	7,080.6
Long-term portion of lease obligations	4,450.6	3,704.4	0.0
Long-term portion of lease obligations	219.4	218.3	0.0
Deferred income taxes	244.6	303.8	0.0
Other long-term liabilities	98.0	58.8	60.7
Total liabilities	12,342.6	11,607.9	10,229.8
Retained earnings (accumulated deficit)	161.6	117.7	(968.0)
Total Penn stockholders’ equity	1,852.7	1,816.9	731.2
Total stockholders’ equity	1,851.9	1,816.9	731.2	$ (73.3)	$ (543.4)
Total liabilities and stockholders’ equity	$ 14,194.5	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 lease obligations		3,704.4
Long-term portion of lease obligations		218.3
Deferred income taxes		303.8
Other long-term 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 lease obligations		0.0
Long-term portion of lease obligations		0.0
Deferred income taxes		0.0
Other long-term 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 lease obligations		0.0
Long-term portion of lease obligations		218.3
Deferred income taxes		4.3
Other long-term 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 lease obligations		3,467.1
Long-term portion of lease obligations		0.0
Deferred income taxes		299.5
Other long-term 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 lease obligations		92.3
Long-term portion of lease obligations		0.0
Deferred income taxes		0.0
Other long-term 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 lease obligations		145.0
Long-term portion of lease obligations		0.0
Deferred income taxes		0.0
Other long-term 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