Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Grandstands and buildings | Minimum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	10 years
Grandstands and buildings | Maximum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	40 years
Equipment | Minimum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	2 years
Equipment | Maximum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	10 years
Furniture and fixtures | Minimum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	2 years
Furniture and fixtures | Maximum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	10 years
Tracks and other improvements | Minimum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	10 years
Tracks and other improvements | Maximum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	20 years
Internally developed and purchased third party software
Variable Interest Entity [Line Items]
Capitalized computer software developed or acquired for internal use	$ 9.7	$ 7.2	$ 6.7
Capitalized computer software developed or acquired for internal use, amortization expense	$ 7.3	6.3	6.0
Internally developed and purchased third party software | Maximum
Variable Interest Entity [Line Items]
Property, plant, and equipment, useful life	3 years
Continuing Operations
Variable Interest Entity [Line Items]
Advertising and marketing expense	$ 28.7	$ 24.8	$ 23.1