Significant Accounting Policies - Customer-Related Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Online Sports Betting and iGaming Market Access
Disaggregation of Revenue [Line Items]
Customer-related liabilities, long-term	$ 58.2	$ 52.2
Loyalty Credit Obligation
Disaggregation of Revenue [Line Items]
Customer-related liabilities, current	$ 45.5	37.6
Contract with customer, term	6 months
Advance Payments on Goods and Services Yet to Be Provided and Unpaid Wagers
Disaggregation of Revenue [Line Items]
Customer-related liabilities	$ 101.6	$ 112.0

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant