Acquisitions, Preliminary Purchase Price Accounting and Proforma Information - Summary of Preliminary Purchase Price Accounting to Identifiable Assets Acquired and Liabilities Assumed (Parenthetical) (Details) - Elgin Acquisition $ in Millions	Sep. 30, 2018 USD ($)
Trade Names
Business Acquisition [Line Items]
Intangible asset residual value	$ 12.6
Player Relationships
Business Acquisition [Line Items]
Intangible asset residual value	28.8
Gaming licenses
Business Acquisition [Line Items]
Intangible asset residual value	$ 163.9