Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Balance, beginning of period	$ 366.8	$ 366.8
Additions	357.0	0.0
Balance, end of period	723.8	366.8
All Other
Goodwill [Roll Forward]
Balance, beginning of period	1.0	1.0
Additions	0.0	0.0
Balance, end of period	1.0	1.0
Live and Historical | Operating Segments
Goodwill [Roll Forward]
Balance, beginning of period	52.4	52.4
Additions	227.9	0.0
Balance, end of period	280.3	52.4
TwinSpires | Operating Segments
Goodwill [Roll Forward]
Balance, beginning of period	152.2	152.2
Additions	0.0	0.0
Balance, end of period	152.2	152.2
Gaming | Operating Segments
Goodwill [Roll Forward]
Balance, beginning of period	161.2	161.2
Additions	129.1	0.0
Balance, end of period	$ 290.3	$ 161.2