Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,122.1	$ 1,026.8
Accumulated depreciation	(514.1)	(466.2)
Total	608.0	560.6
Grandstands and buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	439.8	410.5
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	286.7	258.3
Tracks and other improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	177.9	157.3
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	131.7	117.5
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	60.3	54.4
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23.5	26.7
Artwork
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2.2	$ 2.1