Related party transactions - Related party transactions with affiliated company - Additional Information 1 (Details) - Related Party With Investment Companies - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Administrative Fees	$ 1.1	$ 1.3
Waived Fees	0.4	0.5
Net fees	$ 0.7	$ 0.8

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details