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Fair value measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets
Total postretirement benefit plan assets	$ 265,875	$ 431,047
Common collective trust
Assets
Total postretirement benefit plan assets	6,497	8,882
Mutual funds
Assets
Total postretirement benefit plan assets	50,467	118,559
Fixed income securities
Assets
Total postretirement benefit plan assets	198,628	292,883
Short-term investments
Assets
Total postretirement benefit plan assets	1,099	1,211
Real estate funds
Assets
Total postretirement benefit plan assets	680	592
Cash and accrued income
Assets
Total postretirement benefit plan assets	8,504	8,920
Derivatives designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	(172)	1,491
Derivatives designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	(863)	(121)
Derivatives not designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	(8,638)	683
Derivatives not designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	(54)	(41)
Derivatives not designated as hedging instruments | Interest Rate Lock Contract
Assets
Derivatives, net		(550)
Assets measured at NAV
Assets
Total postretirement benefit plan assets	40,104	50,594
Assets measured at NAV | Common collective trust
Assets
Total postretirement benefit plan assets	6,497	8,882
Assets measured at NAV | Mutual funds
Assets
Total postretirement benefit plan assets	0	0
Assets measured at NAV | Fixed income securities
Assets
Total postretirement benefit plan assets	32,927	41,120
Assets measured at NAV | Short-term investments
Assets
Total postretirement benefit plan assets	0	0
Assets measured at NAV | Real estate funds
Assets
Total postretirement benefit plan assets	680	592
Assets measured at NAV | Cash and accrued income
Assets
Total postretirement benefit plan assets	0	0
Assets measured at NAV | Derivatives designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	0	0
Assets measured at NAV | Derivatives designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	0	0
Assets measured at NAV | Derivatives not designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	0	0
Assets measured at NAV | Derivatives not designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	0	0
Assets measured at NAV | Derivatives not designated as hedging instruments | Interest Rate Lock Contract
Assets
Derivatives, net		0
Level 1
Assets
Total postretirement benefit plan assets	8,504	8,920
Level 1 | Common collective trust
Assets
Total postretirement benefit plan assets	0	0
Level 1 | Mutual funds
Assets
Total postretirement benefit plan assets	0	0
Level 1 | Fixed income securities
Assets
Total postretirement benefit plan assets	0	0
Level 1 | Short-term investments
Assets
Total postretirement benefit plan assets	0	0
Level 1 | Real estate funds
Assets
Total postretirement benefit plan assets	0	0
Level 1 | Cash and accrued income
Assets
Total postretirement benefit plan assets	8,504	8,920
Level 1 | Derivatives designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	0	0
Level 1 | Derivatives designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	0	0
Level 1 | Derivatives not designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	0	0
Level 1 | Derivatives not designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	0	0
Level 1 | Derivatives not designated as hedging instruments | Interest Rate Lock Contract
Assets
Derivatives, net		0
Level 2
Assets
Total postretirement benefit plan assets	217,267	371,533
Level 2 | Common collective trust
Assets
Total postretirement benefit plan assets	0	0
Level 2 | Mutual funds
Assets
Total postretirement benefit plan assets	50,467	118,559
Level 2 | Fixed income securities
Assets
Total postretirement benefit plan assets	165,701	251,763
Level 2 | Short-term investments
Assets
Total postretirement benefit plan assets	1,099	1,211
Level 2 | Real estate funds
Assets
Total postretirement benefit plan assets	0	0
Level 2 | Cash and accrued income
Assets
Total postretirement benefit plan assets	0	0
Level 2 | Derivatives designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	(172)	1,491
Level 2 | Derivatives designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	(863)	(121)
Level 2 | Derivatives not designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	(8,638)	683
Level 2 | Derivatives not designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	(54)	(41)
Level 2 | Derivatives not designated as hedging instruments | Interest Rate Lock Contract
Assets
Derivatives, net		(550)
Level 3
Assets
Total postretirement benefit plan assets	0	0
Level 3 | Common collective trust
Assets
Total postretirement benefit plan assets	0	0
Level 3 | Mutual funds
Assets
Total postretirement benefit plan assets	0	0
Level 3 | Fixed income securities
Assets
Total postretirement benefit plan assets	0	0
Level 3 | Short-term investments
Assets
Total postretirement benefit plan assets	0	0
Level 3 | Real estate funds
Assets
Total postretirement benefit plan assets	0	0
Level 3 | Cash and accrued income
Assets
Total postretirement benefit plan assets	0	0
Level 3 | Derivatives designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	0	0
Level 3 | Derivatives designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	0	0
Level 3 | Derivatives not designated as hedging instruments | Commodity Contracts
Assets
Derivatives, net	0	0
Level 3 | Derivatives not designated as hedging instruments | Foreign Exchange Contracts
Assets
Derivatives, net	$ 0	0
Level 3 | Derivatives not designated as hedging instruments | Interest Rate Lock Contract
Assets
Derivatives, net		$ 0

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