Fair Value Measurements - Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Jul. 01, 2021	Feb. 28, 2021	May 31, 2020	Jan. 19, 2017
Financial assets:
Equity securities	$ 10.7	$ 17.1
Senior Notes | 5.625% Notes due 2027
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%
Convertible Notes
Financial liabilities:
Long-term debt	$ 24.2
Convertible Notes | Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	2.75%				2.75%
Other long-term obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate				27.00%
Fair Value, Recurring | Level 1
Financial assets:
Cash and cash equivalents	$ 1,071.8	1,624.0
Equity securities	10.7	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		0.0
Fair Value, Recurring | Level 1 | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,483.5	1,514.7
Fair Value, Recurring | Level 1 | Senior Notes | 5.625% Notes due 2027
Financial liabilities:
Long-term debt	388.0	371.0
Fair Value, Recurring | Level 1 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	340.0	327.0
Fair Value, Recurring | Level 1 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	427.6	550.8
Fair Value, Recurring | Level 1 | Other long-term obligations
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, 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
Fair Value, Recurring | Level 2 | Amended Credit Facilities
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, Recurring | Level 2 | Senior Notes | 5.625% Notes due 2027
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, Recurring | Level 2 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, Recurring | Level 2 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, Recurring | Level 2 | Other long-term obligations
Financial liabilities:
Long-term debt	18.0	36.4
Fair Value, Recurring | Level 3
Financial assets:
Cash and cash equivalents	0.0	0.0
Equity securities	0.0	0.0
Available-for-sale debt securities	24.2
Held-to-maturity securities	0.0	0.0
Promissory notes	0.0	0.0
Financial liabilities:
Other liabilities	76.2	7.2
Puts and calls related to certain Barstool shares		0.0
Fair Value, Recurring | Level 3 | Amended Credit Facilities
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, Recurring | Level 3 | Senior Notes | 5.625% Notes due 2027
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, Recurring | Level 3 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, Recurring | Level 3 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	0.0	0.0
Fair Value, Recurring | Level 3 | Other long-term obligations
Financial liabilities:
Long-term debt	154.1	118.0
Fair Value, Recurring | Carrying Amount
Financial assets:
Cash and cash equivalents	1,071.8	1,624.0
Equity securities	10.7	17.1
Available-for-sale debt securities	24.2
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	79.0	9.9
Puts and calls related to certain Barstool shares		0.4
Fair Value, Recurring | Carrying Amount | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,471.7	1,503.6
Fair Value, Recurring | Carrying Amount | Senior Notes | 5.625% Notes due 2027
Financial liabilities:
Long-term debt	399.7	399.7
Fair Value, Recurring | Carrying Amount | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	394.6	393.8
Fair Value, Recurring | Carrying Amount | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	326.1	324.3
Fair Value, Recurring | Carrying Amount | Other long-term obligations
Financial liabilities:
Long-term debt	173.5	156.1
Fair Value, Recurring | Fair Value
Financial assets:
Cash and cash equivalents	1,071.8	1,624.0
Equity securities	10.7	17.1
Available-for-sale debt securities	24.2
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	78.9	9.6
Puts and calls related to certain Barstool shares		0.4
Fair Value, Recurring | Fair Value | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,483.5	1,514.7
Fair Value, Recurring | Fair Value | Senior Notes | 5.625% Notes due 2027
Financial liabilities:
Long-term debt	388.0	371.0
Fair Value, Recurring | Fair Value | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	340.0	327.0
Fair Value, Recurring | Fair Value | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	427.6	550.8
Fair Value, Recurring | Fair Value | Other long-term obligations
Financial liabilities:
Long-term debt	$ 172.1	$ 154.4