Accounts Receivable - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bad debt expense	$ 1.7	$ 1.2	$ 1.1
Accounts receivable, net	(28.8)	$ (49.6)		$ (27.8)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	$ 24.9			21.8
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Kentucky Derby-related receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net				$ 21.8