Other Balance Sheet Items - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Net, Current [Abstract]
Accounts receivable, gross	$ 41.7	$ 32.8
Allowance for doubtful accounts	(4.4)	(4.0)
Accounts receivable, net	37.3	28.8
Trade receivables
Accounts Receivable, Net, Current [Abstract]
Accounts receivable, gross	12.3	7.7
Simulcast and online wagering receivables
Accounts Receivable, Net, Current [Abstract]
Accounts receivable, gross	20.9	19.9
Other receivables
Accounts Receivable, Net, Current [Abstract]
Accounts receivable, gross	$ 8.5	$ 5.2