Summary of Significant Accounting Policies, Reclassifications (Details) - Reclassification Adjustment [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2021
General and Administration Expenses [Member]
Reclassifications [Abstract]
Events and other miscellaneous selling costs	$ (2.7)	$ (4.9)
Selling Expenses [Member]
Reclassifications [Abstract]
Events and other miscellaneous selling costs	$ 2.7	$ 4.9

Amount of selling and marketing expense classified as other.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Name:	us-gaap_OtherSellingAndMarketingExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration