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Description of Business (Details) $ in Millions						3 Months Ended		14 Months Ended
Description of Business (Details) $ in Millions	Oct. 09, 2019 USD ($) a	Mar. 08, 2019 USD ($)	Mar. 06, 2019 USD ($)	Mar. 05, 2019 USD ($)	Jan. 11, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2021 USD ($)	Mar. 16, 2020 USD ($)
Variable Interest Entity [Line Items]
Proceeds from borrowings under long-term debt obligations						$ 719.8	$ 1,231.9
Proceeds from new credit facilities						719.8	$ 1,231.9
Revolving Credit Facility \| Line of Credit
Variable Interest Entity [Line Items]
Borrowings									$ 675.4
Proceeds from borrowings under long-term debt obligations						700.9
Proceeds from new credit facilities						$ 700.9
Presque Isle Downs & Casino And Lady Luck Casino
Variable Interest Entity [Line Items]
Payments to acquire business					$ 178.9
Presque Isle Downs & Casino
Variable Interest Entity [Line Items]
Working capital and other purchase price adjustments					$ 1.6
Lady Luck Nemacolin
Variable Interest Entity [Line Items]
Payments to acquire business		$ 0.1
Turfway Park
Variable Interest Entity [Line Items]
Payments to acquire business	$ 36.0
Working capital and other purchase price adjustments	0.9
Total consideration	$ 46.0
Area of land \| a	197
Turfway Park \| Scenario, Plan \| Maximum
Variable Interest Entity [Line Items]
Total consideration	$ 150.0
Midwest Gaming Holdings, LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage			61.30%	42.00%		61.30%
Aggregated cash consideration paid at closing of the Sale Transaction				$ 406.6
Deferred tax liability				103.2		$ 103.2
Clairvest Group Inc.
Variable Interest Entity [Line Items]
Transaction costs				3.5
Subsequent Event \| Revolving Credit Facility \| Line of Credit
Variable Interest Entity [Line Items]
Minimum liquidity financial covenant								$ 150.0
Midwest Gaming Holdings, LLC
Variable Interest Entity [Line Items]
Proceeds from borrowings under long-term debt obligations			$ 300.0	300.0
Proceeds from new credit facilities			$ 300.0	$ 300.0
High Plaines \| Midwest Gaming Holdings, LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage			36.00%			36.00%
Casino Investors \| Midwest Gaming Holdings, LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage			2.70%			2.70%