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Segment Information - Total Asset Information For Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 3,203.8		$ 2,551.0
Capital expenditures	48.3	$ 28.1
Operating Segments | Total Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,553.1		1,641.9
Capital expenditures	19.0	23.6
Operating Segments | Churchill Downs
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	369.1		370.3
Capital expenditures	12.1	9.6
Operating Segments | Online Wagering
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	243.7		241.5
Capital expenditures	3.6	11.5
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	940.3		1,030.1
Capital expenditures	3.3	2.5
Segment Reconciling Items | All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,650.7		$ 909.1
Capital expenditures	$ 29.3	$ 4.5

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 280
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