Significant Accounting Policies - Concentration of Credit Risk and Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (7.7)	$ (3.2)
Accounts receivable, net	88.7	106.8
Markers issued to customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	22.9	17.2
Credit card receivables and other advances to customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	16.5	20.9
Receivables from ATM and cash kiosk transactions
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	14.4	19.2
Hotel and banquet receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	6.5	8.1
Racing settlements
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	6.6	6.1
Receivables due from platform providers for social casino games
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	3.3	2.3
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	$ 26.2	$ 36.2

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