Acquisitions and Other Investments - Allocation of Purchase Price (Details) - USD ($) $ in Millions	7 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	May 23, 2019	Jan. 01, 2019	Dec. 31, 2018	Oct. 15, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,270.7	$ 1,270.7		$ 1,233.9	$ 1,228.4		$ 1,008.1
Greektown Casino-Hotel
Business Acquisition [Line Items]
Cash and cash equivalents	31.1	31.1	$ 31.1
Receivables, prepaid expenses, and other current assets	14.5	14.5	15.7
Property and equipment	28.4	28.4	32.3
Goodwill	67.4	67.4	61.7
Operating lease right-of-use assets	516.1	516.1	516.1
Finance lease right-of-use assets	4.1	4.1	4.1
Other long-term assets	0.0	0.0	0.2
Total assets	855.7	855.7	855.3
Accounts payable, accrued expenses and other current liabilities	15.2	15.2	14.8
Operating lease liabilities	516.1	516.1	516.1
Finance lease liabilities	4.1	4.1	4.1
Total liabilities	535.4	535.4	535.0
Net assets acquired	320.3	320.3	320.3
Goodwill tax deductible amount			67.4
Measurement period adjustments
Receivables, prepaid expenses, and other current assets	(1.2)
Property and equipment	(3.9)
Goodwill	5.7
Other assets	(0.2)
Total assets	0.4
Accounts payable, accrued expenses and other current liabilities	0.4
Total liabilities	0.4
Net assets acquired	0.0
Greektown Casino-Hotel | Customer relationships
Business Acquisition [Line Items]
Amortizing intangible assets	3.3	3.3	3.3
Greektown Casino-Hotel | Gaming licenses
Business Acquisition [Line Items]
Indefinite-lived intangible assets	166.4	166.4	166.4
Greektown Casino-Hotel | Trademarks
Business Acquisition [Line Items]
Indefinite-lived intangible assets	24.4	24.4	$ 24.4
Margaritaville Resort Casino
Business Acquisition [Line Items]
Cash and cash equivalents	10.7	10.7		10.7
Receivables, prepaid expenses, and other current assets	7.0	7.0		7.1
Property and equipment	20.7	20.7		21.7
Goodwill	44.2	44.2		39.5
Operating lease right-of-use assets	196.2	196.2		196.2
Total assets	329.2	329.2		325.6
Accounts payable, accrued expenses and other current liabilities	10.1	10.1		9.5
Operating lease liabilities	196.2	196.2		196.2
Total liabilities	206.3	206.3		205.7
Net assets acquired	122.9	122.9		119.9
Goodwill tax deductible amount				44.2
Measurement period adjustments
Receivables, prepaid expenses, and other current assets		(0.1)
Property and equipment		(1.0)
Goodwill		4.7
Total assets		3.6
Accounts payable, accrued expenses and other current liabilities		0.6
Total liabilities		0.6
Net assets acquired		3.0
Margaritaville Resort Casino | Customer relationships
Business Acquisition [Line Items]
Amortizing intangible assets	2.3	2.3		2.3
Margaritaville Resort Casino | Gaming licenses
Business Acquisition [Line Items]
Indefinite-lived intangible assets	48.1	48.1		$ 48.1
Pinnacle
Business Acquisition [Line Items]
Cash and restricted cash	124.2	124.2				$ 124.2
Assets held for sale	667.5	667.5				667.0
Other current assets	81.1	81.1				80.6
Goodwill	238.2	238.2				219.5
Other long-term assets	38.9	38.9				38.9
Total assets	6,811.4	6,811.4				6,799.6
Long-term financing obligation, including current portion	3,432.5	3,432.5				3,427.0
Other current liabilities	206.1	206.1				200.6
Deferred tax liabilities	340.0	340.0				339.2
Other long-term liabilities	16.6	16.6				16.6
Total liabilities	3,995.2	3,995.2				3,983.4
Net assets acquired	2,816.2	2,816.2				2,816.2
Measurement period adjustments
Assets held for sale		0.5
Receivables, prepaid expenses, and other current assets		0.5
Goodwill		18.7
Total assets		11.8
Long-term financing obligation, including current portion		5.5
Other current liabilities		5.5
Deferred tax liabilities		0.8
Total liabilities		11.8
Net assets acquired		0.0
Pinnacle | Customer relationships
Business Acquisition [Line Items]
Amortizing intangible assets	22.4	22.4				22.4
Pinnacle | Gaming licenses
Business Acquisition [Line Items]
Indefinite-lived intangible assets	1,067.6	1,067.6				1,046.0
Measurement period adjustments
Indefinite-lived intangible assets		21.6
Pinnacle | Trademarks
Business Acquisition [Line Items]
Indefinite-lived intangible assets	298.0	298.0				298.0
Property and equipment - Not Subject to Master Leases | Pinnacle
Business Acquisition [Line Items]
Property and equipment	318.6	318.6				318.9
Measurement period adjustments
Property and equipment		(0.3)
Property and equipment - Subject to Master Leases | Pinnacle
Business Acquisition [Line Items]
Property and equipment	$ 3,954.9	3,954.9				$ 3,984.1
Measurement period adjustments
Property and equipment		$ (29.2)