Other Balance Sheet Items - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Accrued salaries and related benefits	$ 29.2	$ 24.1
Account wagering deposits liability	28.9	29.6
Purses payable	19.9	15.8
Accrued interest	19.7	11.4
Other	75.7	54.3
Total	$ 173.4	$ 135.2