Acquisitions and Dispositions - Allocation of Purchase Price (Details) - USD ($) $ in Millions	Dec. 31, 2021	Oct. 19, 2021	Dec. 31, 2020	Dec. 31, 2019	May 23, 2019	Jan. 01, 2019
Business Acquisition [Line Items]
Goodwill	$ 2,822.5		$ 1,157.1	$ 1,270.7
Greektown Casino-Hotel
Business Acquisition [Line Items]
Cash and cash equivalents					$ 31.1
Receivables, prepaid expenses, and other current assets					14.5
Property and equipment					28.4
Goodwill					67.4
Operating lease right-of-use assets					516.1
Finance lease right-of-use assets					4.1
Other assets					0.0
Total assets					855.7
Accounts payable, accrued expenses and other current liabilities					15.2
Operating lease liabilities					516.1
Finance lease liabilities					4.1
Total liabilities					535.4
Net assets acquired					320.3
Goodwill tax deductible amount					67.4
Greektown Casino-Hotel | Customer relationships
Business Acquisition [Line Items]
Other intangible assets					3.3
Greektown Casino-Hotel | Gaming licenses
Business Acquisition [Line Items]
Other intangible assets					$ 166.4
Margaritaville Resort Casino
Business Acquisition [Line Items]
Cash and cash equivalents						$ 10.7
Receivables, prepaid expenses, and other current assets						7.0
Property and equipment						20.7
Goodwill						44.2
Operating lease right-of-use assets						196.2
Total assets						329.2
Accounts payable, accrued expenses and other current liabilities						10.1
Operating lease liabilities						196.2
Total liabilities						206.3
Net assets acquired						122.9
Goodwill tax deductible amount						44.2
Margaritaville Resort Casino | Customer relationships
Business Acquisition [Line Items]
Other intangible assets						2.3
Margaritaville Resort Casino | Gaming licenses
Business Acquisition [Line Items]
Other intangible assets						$ 48.1
theScore
Business Acquisition [Line Items]
Cash and cash equivalents		$ 160.3
Other current assets		22.8
Goodwill		1,690.2
Operating lease right-of-use assets		2.6
Other assets		5.2
Total assets		2,221.5
Accounts payable, accrued expenses and other current liabilities		67.9
Deferred tax liabilities		69.2
Other non-current liabilities		1.7
Total liabilities		138.8
Net assets acquired		2,082.7
Goodwill tax deductible amount	$ 0.0
theScore | Property and equipment
Business Acquisition [Line Items]
Property and equipment		1.8
theScore | Media technology
Business Acquisition [Line Items]
Other intangible assets		57.0
theScore | Customer relationships
Business Acquisition [Line Items]
Other intangible assets		8.0
theScore | Other
Business Acquisition [Line Items]
Other intangible assets		2.6
theScore | Gaming licenses
Business Acquisition [Line Items]
Other intangible assets		160.0
theScore | Tradename
Business Acquisition [Line Items]
Other intangible assets		100.0
theScore | Advertising relationships
Business Acquisition [Line Items]
Other intangible assets		$ 11.0