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Pension and other post-retirement benefits - Fair Value of Investments by Asset Category (Details) - Level 1 $ in Thousands	Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	100.00%
Fair value of plan assets	$ 805,773
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	59.00%
Fair value of plan assets	$ 479,506
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	32.00%
Fair value of plan assets	$ 255,975
Other
Defined Benefit Plan Disclosure [Line Items]
Allocation percentage	9.00%
Fair value of plan assets	$ 70,292

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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