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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable is comprised of the following:
 
As of December 31,
(in millions)
2018
 
2017
Trade receivables
$
6.0

 
$
5.5

Kentucky Derby-related receivables
1.7

 
22.3

Simulcast and mobile and online wagering receivables
19.9

 
20.5

Other receivables
5.2

 
4.9

 
32.8

 
53.2

Allowance for doubtful accounts
(4.0
)
 
(3.6
)
Total
$
28.8

 
$
49.6