Aggregate amount of interest expense on all borrowings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.7,8)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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

Borrowed Funds - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Interest expense, borrowings			$ 1.8	$ 3.9	$ 7.1	$ 13.1
Available-for-sale Securities
Debt Instrument [Line Items]
Securities Sold Under Repurchase Agreements	$ 129.7	$ 105.1