Fair Value Measurements - Significant Unobservable Inputs for Fair Value Measurements (Details) $ in Millions	Dec. 31, 2024 USD ($)	Oct. 01, 2024 USD ($)	Dec. 31, 2023 USD ($)	Oct. 01, 2023 USD ($)
Gaming licenses | Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, fair value	$ 71.0	$ 71.0	$ 130.0	$ 130.0
Trademarks | Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, fair value	$ 56.0	56.0
Level 3 | Gaming licenses | Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, fair value		71.0		$ 130.0
Level 3 | Trademarks | Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, fair value		$ 56.0
Level 3 | Discounted cash flow | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale debt securities	0.350
Other long-term obligation	0.270
Level 3 | Discounted cash flow | Discount rate | Plainridge Park Casino
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent purchase price - Plainridge Park Casino	0.066
Level 3 | Discounted cash flow | Discount rate | Gaming licenses
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.125
Level 3 | Discounted cash flow | Discount rate | Gaming licenses | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input			0.125
Level 3 | Discounted cash flow | Discount rate | Gaming licenses | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input			0.130
Level 3 | Discounted cash flow | Discount rate | Trademarks | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.125
Level 3 | Discounted cash flow | Discount rate | Trademarks | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.145
Level 3 | Discounted cash flow | Long-term revenue growth rate | Gaming licenses
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.020		0.020
Level 3 | Discounted cash flow | Long-term revenue growth rate | Trademarks | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.020
Level 3 | Discounted cash flow | Long-term revenue growth rate | Trademarks | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.040
Level 3 | Discounted cash flow | Pretax royalty rate | Trademarks | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.015
Level 3 | Discounted cash flow | Pretax royalty rate | Trademarks | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Indefinite-lived intangible assets, measurement input	0.050