Fair Value Measurements - Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($) $ in Millions	Dec. 31, 2021	Feb. 28, 2021	Dec. 31, 2020	Jan. 19, 2017
Financial assets:
Equity securities	$ 84.3		$ 143.1
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%
Notes Payable, Other Payables
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	$ 1,863.9		$ 1,853.8
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
Financial liabilities:
Other liabilities	0.0		0.0
Puts and calls related to certain Barstool Sports shares			0.0
Fair Value, Recurring | Level 1 | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,559.6		1,609.3
Fair Value, Recurring | Level 1 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	411.5		418.0
Fair Value, Recurring | Level 1 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	389.5
Fair Value, Recurring | Level 1 | Convertible Notes
Financial liabilities:
Long-term debt	780.0		1,274.5
Fair Value, Recurring | Level 1 | Notes Payable, Other Payables
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	84.3		143.1
Held-to-maturity securities	6.7		6.7
Promissory notes	15.1		15.1
Puts and calls related to certain Barstool Sports shares	1.9
Financial liabilities:
Other liabilities	2.7		2.8
Puts and calls related to certain Barstool Sports shares			0.3
Fair Value, Recurring | Level 2 | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	0.0		0.0
Fair Value, Recurring | Level 2 | Senior Notes | 5.625% Notes
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
Fair Value, Recurring | Level 2 | Convertible Notes
Financial liabilities:
Long-term debt	0.0		0.0
Fair Value, Recurring | Level 2 | Notes Payable, Other Payables
Financial liabilities:
Long-term debt	53.9		72.8
Fair Value, 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
Financial liabilities:
Other liabilities	10.5		7.3
Puts and calls related to certain Barstool Sports shares			0.0
Fair Value, Recurring | Level 3 | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	0.0		0.0
Fair Value, Recurring | Level 3 | Senior Notes | 5.625% Notes
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
Fair Value, Recurring | Level 3 | Convertible Notes
Financial liabilities:
Long-term debt	0.0		0.0
Fair Value, Recurring | Level 3 | Notes Payable, Other Payables
Financial liabilities:
Long-term debt	90.4		0.0
Fair Value, Recurring | Carrying Amount
Financial assets:
Cash and cash equivalents	1,863.9		1,853.8
Equity securities	84.3		143.1
Held-to-maturity securities	6.7		6.7
Promissory notes	15.1		15.1
Puts and calls related to certain Barstool Sports shares	1.9
Financial liabilities:
Other liabilities	13.3		10.1
Puts and calls related to certain Barstool Sports shares			0.3
Fair Value, Recurring | Carrying Amount | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,544.5		1,600.3
Fair Value, Recurring | Carrying Amount | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	399.6		399.5
Fair Value, Recurring | Carrying Amount | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	392.9
Fair Value, Recurring | Carrying Amount | Convertible Notes
Financial liabilities:
Long-term debt	253.5		239.8
Fair Value, Recurring | Carrying Amount | Notes Payable, Other Payables
Financial liabilities:
Long-term debt	146.3		73.0
Fair Value, Recurring | Fair Value
Financial assets:
Cash and cash equivalents	1,863.9		1,853.8
Equity securities	84.3		143.1
Held-to-maturity securities	6.7		6.7
Promissory notes	15.1		15.1
Puts and calls related to certain Barstool Sports shares	1.9
Financial liabilities:
Other liabilities	13.2		10.1
Puts and calls related to certain Barstool Sports shares			0.3
Fair Value, Recurring | Fair Value | Senior Secured Credit Facilities
Financial liabilities:
Long-term debt	1,559.6		1,609.3
Fair Value, Recurring | Fair Value | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	411.5		418.0
Fair Value, Recurring | Fair Value | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	389.5
Fair Value, Recurring | Fair Value | Convertible Notes
Financial liabilities:
Long-term debt	780.0		1,274.5
Fair Value, Recurring | Fair Value | Notes Payable, Other Payables
Financial liabilities:
Long-term debt	$ 144.3		$ 72.8