Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,781.3	$ 1,547.9
Accumulated depreciation	(721.5)	(635.4)
Subtotal	1,059.8	912.5
Operating lease right-of-use assets	22.3	24.8
Total	1,082.1	937.3
Grandstands and buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	785.5	625.2
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	477.9	406.5
Tracks and other improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	240.7	222.3
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	164.2	162.4
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	89.7	79.2
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 23.3	$ 52.3