The amount of identifiable intangible assets recognized as of the acquisition date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Subsequent events- Additional Information (Details) - USD ($) $ in Millions	Oct. 15, 2022	Sep. 30, 2022	Dec. 31, 2021
Subsequent Events
Developed technology - Software intangible assets		$ 0.7	$ 0.7
Subsequent event \| US Treasury Securities
Subsequent Events
Available-for-sale transfer to Held-to-maturity, unrealized losses before tax	$ 873.1
Available-for-sale securities transfer to Held-to-maturity	6,500.0
Available-for-sale securities transfer to Held-to-Maturity at par value	$ 7,400.0