Other Balance Sheet Items - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Accrued salaries and related benefits	$ 19.6	$ 29.2
Account wagering deposits liability	38.1	28.9
Purses payable	18.5	19.9
Accrued interest	19.2	19.7
Other	72.4	75.7
Total	$ 167.8	$ 173.4