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Commitments and Contingencies - Lease commitments and operating lease cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies
Operating lease cost	$ 3.6	$ 3.8	$ 3.6

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- References

No definition available.

+ Details

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- Definition

Amount of periodic reduction over lease term of carrying amount of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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