Amount of increase (decrease) of investment in debt and equity securities, measured at fair value with changes in fair value recognized in net income.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 19
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-19

Name:	us-gaap_IncreaseDecreaseInTradingSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Investment Securities - Hedge Funds and Private Equity Funds (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) fund	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Investments in trading securities \| $	$ 81.6	$ 0.0
Private equity funds
Debt and Equity Securities, FV-NI [Line Items]
Number of investments \| fund	18
Hedge funds
Debt and Equity Securities, FV-NI [Line Items]
Number of investments \| fund	2
Total private equity funds and hedge funds included in other long-term investments
Debt and Equity Securities, FV-NI [Line Items]
Largest single fund investment \| $	$ 54.3		$ 49.0