Number of pending claims pertaining to a loss contingency.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Legal Proceedings - Narrative (Details) $ in Millions	Jun. 30, 2021 USD ($)	Mar. 12, 2021 USD ($)	Jan. 31, 2019 claim
SDC Dispute
Loss Contingencies [Line Items]
Amount owed from other party		$ 43.4
2018 Securities Class Action Lawsuit
Loss Contingencies [Line Items]
Settlement amount	$ 16.0
Shareholder Derivative Lawsuit
Loss Contingencies [Line Items]
Number of lawsuits \| claim			3