Postretirement Benefits - Schedule of Investment Funds (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment funds, unfunded commitments	$ 744,000
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected life of non-redeemable funds	7 years
Expected life of non-redeemable funds with extension options	2 years
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected life of non-redeemable funds	10 years
Expected life of non-redeemable funds with extension options	4 years
Multi-asset class
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment funds, Fair Value	$ 14,714	$ 14,288
Investment funds, unfunded commitments	7,203
Private equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment funds, Fair Value	3,600	0
Investment funds, unfunded commitments	56,472
Investment Funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment funds, Fair Value	18,314	$ 14,288
Investment funds, unfunded commitments	$ 63,675

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 54B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482134/820-10-35-54B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
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