Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Jul. 01, 2021	May 31, 2020
Financial assets:
Equity securities	$ 8.6	$ 17.1
Senior Notes | 5.625% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	5.625%	5.625%
Senior Notes | 4.125% Notes due 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	4.125%	4.125%	4.125%
Convertible Notes | Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate				2.75%
Recurring | Level 1
Financial assets:
Cash and cash equivalents	$ 1,317.9	$ 1,624.0
Equity securities	8.6	0.0
Available-for-sale debt securities	0.0
Held-to-maturity securities	0.0	0.0
Promissory notes	0.0	0.0
Financial liabilities:
Other liabilities	0.0	0.0
Puts and calls related to certain Barstool shares
Recurring | Level 1 | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,495.5	1,514.7
Recurring | Level 1 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	372.0	371.0
Recurring | Level 1 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	322.0	327.0
Recurring | Level 1 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	400.7	550.8
Recurring | Level 1 | Other long-term obligations
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 2
Financial assets:
Cash and cash equivalents	0.0	0.0
Equity securities	0.0	17.1
Available-for-sale debt securities	0.0
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	2.7	2.4
Puts and calls related to certain Barstool shares		0.4
Recurring | Level 2 | Amended Credit Facilities
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 2 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 2 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 2 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 2 | Other long-term obligations
Financial liabilities:
Long-term debt	27.1	36.4
Recurring | Level 3
Financial assets:
Cash and cash equivalents	0.0	0.0
Equity securities	0.0	0.0
Available-for-sale debt securities	20.0
Held-to-maturity securities	0.0	0.0
Promissory notes	0.0	0.0
Financial liabilities:
Other liabilities	76.1	7.2
Puts and calls related to certain Barstool shares		0.0
Recurring | Level 3 | Amended Credit Facilities
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Other long-term obligations
Financial liabilities:
Long-term debt	144.2	118.0
Recurring | Carrying Amount
Financial assets:
Cash and cash equivalents	1,317.9	1,624.0
Equity securities	8.6	17.1
Available-for-sale debt securities	20.0
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	78.9	9.9
Puts and calls related to certain Barstool shares		0.4
Recurring | Carrying Amount | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,479.7	1,503.6
Recurring | Carrying Amount | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	399.7	399.7
Recurring | Carrying Amount | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	394.5	393.8
Recurring | Carrying Amount | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	325.6	324.3
Recurring | Carrying Amount | Other long-term obligations
Financial liabilities:
Long-term debt	172.6	156.1
Recurring | Fair Value
Financial assets:
Cash and cash equivalents	1,317.9	1,624.0
Equity securities	8.6	17.1
Available-for-sale debt securities	20.0
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	78.8	9.6
Puts and calls related to certain Barstool shares		0.4
Recurring | Fair Value | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,495.5	1,514.7
Recurring | Fair Value | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	372.0	371.0
Recurring | Fair Value | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	322.0	327.0
Recurring | Fair Value | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	400.7	550.8
Recurring | Fair Value | Other long-term obligations
Financial liabilities:
Long-term debt	$ 171.3	$ 154.4