Goodwill and Other Intangible Assets - Reporting Units With Negative Carrying Values (Details) $ in Millions	Mar. 31, 2020 USD ($)
Northeast segment | Hollywood Casino at Charles Town Races
Goodwill [Line Items]
Reporting unit with negative carrying amount, goodwill	$ 8.7
Northeast segment | Hollywood Casino Toledo
Goodwill [Line Items]
Reporting unit with negative carrying amount, goodwill	5.8
Northeast segment | Plainridge Park Casino
Goodwill [Line Items]
Reporting unit with negative carrying amount, goodwill	6.3
Midwest segment | Ameristar Council Bluffs
Goodwill [Line Items]
Reporting unit with negative carrying amount, goodwill	36.2
South segment | Boomtown New Orleans
Goodwill [Line Items]
Reporting unit with negative carrying amount, goodwill	$ 5.2