Fair Value Measurements - Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Jul. 01, 2021	May 31, 2020	Jan. 19, 2017
Financial assets:
Equity securities	$ 20.6	$ 84.3
Senior Notes | 5.625% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	5.625%	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 | 2.75% Convertible Notes due 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	2.75%			2.75%
Recurring | Level 1
Financial assets:
Cash and cash equivalents	$ 1,728.4	$ 1,863.9
Equity securities	0.0	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	0.0
Recurring | Level 1 | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,491.1	1,559.6
Recurring | Level 1 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	353.6	411.5
Recurring | Level 1 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	306.6	389.5
Recurring | Level 1 | Convertible Notes | 2.75% Convertible Notes due 2026
Financial liabilities:
Long-term debt	457.8	780.0
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	20.6	84.3
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	15.1
Financial liabilities:
Other liabilities	2.5	2.7
Puts and calls related to certain Barstool shares	0.4	1.9
Recurring | Level 2 | Senior Secured 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 | 2.75% Convertible Notes due 2026
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 2 | Other long-term obligations
Financial liabilities:
Long-term debt	45.0	53.9
Recurring | Level 3
Financial assets:
Cash and cash equivalents	0.0	0.0
Equity securities	0.0	0.0
Held-to-maturity securities	0.0	0.0
Promissory notes	0.0	0.0
Financial liabilities:
Other liabilities	6.9	10.5
Puts and calls related to certain Barstool shares	0.0	0.0
Recurring | Level 3 | Senior Secured 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 | 2.75% Convertible Notes due 2026
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Other long-term obligations
Financial liabilities:
Long-term debt	110.4	90.4
Recurring | Carrying Amount
Financial assets:
Cash and cash equivalents	1,728.4	1,863.9
Equity securities	20.6	84.3
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	15.1
Financial liabilities:
Other liabilities	9.7	13.3
Puts and calls related to certain Barstool shares	0.4	1.9
Recurring | Carrying Amount | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,511.7	1,544.5
Recurring | Carrying Amount | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	399.6	399.6
Recurring | Carrying Amount | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	393.6	392.9
Recurring | Carrying Amount | Convertible Notes | 2.75% Convertible Notes due 2026
Financial liabilities:
Long-term debt	323.9	253.5
Recurring | Carrying Amount | Other long-term obligations
Financial liabilities:
Long-term debt	157.2	146.3
Recurring | Fair Value
Financial assets:
Cash and cash equivalents	1,728.4	1,863.9
Equity securities	20.6	84.3
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	15.1
Financial liabilities:
Other liabilities	9.4	13.2
Puts and calls related to certain Barstool shares	0.4	1.9
Recurring | Fair Value | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,491.1	1,559.6
Recurring | Fair Value | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	353.6	411.5
Recurring | Fair Value | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	306.6	389.5
Recurring | Fair Value | Convertible Notes | 2.75% Convertible Notes due 2026
Financial liabilities:
Long-term debt	457.8	780.0
Recurring | Fair Value | Other long-term obligations
Financial liabilities:
Long-term debt	$ 155.4	$ 144.3