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Defined benefit and 401(k) savings plan - Accumulated Other Comprehensive Loss Before Income Tax (Details) $ in Millions	Dec. 31, 2022 USD ($)
Retirement Benefits [Abstract]
Net actuarial gain	$ 9.0
Prior service cost	(0.3)
Total recognized in other comprehensive income (loss)	$ 8.7

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
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