Fair Value Measurements - Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Jul. 01, 2021	May 31, 2020	Jan. 19, 2017
Financial assets:
Equity securities	$ 48.2	$ 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	$ 1,805.5	$ 1,863.9
Equity securities	0.0	0.0
Held-to-maturity securities	0.0	0.0
Promissory notes	0.0	0.0
Puts and calls related to certain Barstool Sports shares	0.0	0.0
Financial liabilities:
Other liabilities	0.0	0.0
Recurring | Level 1 | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,530.7	1,559.6
Recurring | Level 1 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	396.0	411.5
Recurring | Level 1 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	356.0	389.5
Recurring | Level 1 | Convertible Notes | 2.75% Convertible Notes due 2026
Financial liabilities:
Long-term debt	676.3	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	48.2	84.3
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	15.1
Puts and calls related to certain Barstool Sports shares	0.9	1.9
Financial liabilities:
Other liabilities	2.6	2.7
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	53.4	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
Puts and calls related to certain Barstool Sports shares	0.0	0.0
Financial liabilities:
Other liabilities	10.4	10.5
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	96.6	90.4
Recurring | Carrying Amount
Financial assets:
Cash and cash equivalents	1,805.5	1,863.9
Equity securities	48.2	84.3
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	15.1
Puts and calls related to certain Barstool Sports shares	0.9	1.9
Financial liabilities:
Other liabilities	13.1	13.3
Recurring | Carrying Amount | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,526.1	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	393.1	392.9
Recurring | Carrying Amount | Convertible Notes | 2.75% Convertible Notes due 2026
Financial liabilities:
Long-term debt	323.1	253.5
Recurring | Carrying Amount | Other long-term obligations
Financial liabilities:
Long-term debt	151.9	146.3
Recurring | Fair Value
Financial assets:
Cash and cash equivalents	1,805.5	1,863.9
Equity securities	48.2	84.3
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	15.1
Puts and calls related to certain Barstool Sports shares	0.9	1.9
Financial liabilities:
Other liabilities	13.0	13.2
Recurring | Fair Value | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,530.7	1,559.6
Recurring | Fair Value | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	396.0	411.5
Recurring | Fair Value | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	356.0	389.5
Recurring | Fair Value | Convertible Notes | 2.75% Convertible Notes due 2026
Financial liabilities:
Long-term debt	676.3	780.0
Recurring | Fair Value | Other long-term obligations
Financial liabilities:
Long-term debt	$ 150.0	$ 144.3