Employee Benefit Plans and Other Postretirement Benefits - Schedule of Fair Value of Pension Plan and Postretirement Healthcare Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure
Total benefit plan assets	$ 1,901,824	$ 1,809,543
Pension Benefits | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	1,899,438	1,805,734
Pension Benefits | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	660,858	945,043
Pension Benefits | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	1,238,579	860,691
Pension Benefits | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Total benefit plan assets	2,386	3,809
Pension Benefits | Cash and cash equivalents | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	27,730	43,062
Pension Benefits | Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Pension Benefits | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	27,730	43,062
Pension Benefits | Equity Holdings | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	494,194	801,479
Pension Benefits | Equity Holdings | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	494,143	801,439
Pension Benefits | Equity Holdings | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	51	40
Pension Benefits | U.S. companies | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	346,895	537,587
Pension Benefits | U.S. companies | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	346,844	537,548
Pension Benefits | U.S. companies | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	51	39
Pension Benefits | Foreign companies | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	22,425	22,445
Pension Benefits | Foreign companies | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	22,425	22,444
Pension Benefits | Foreign companies | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	1
Pension Benefits | Pooled equity funds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	124,853	241,412
Pension Benefits | Pooled equity funds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	124,853	241,412
Pension Benefits | Pooled equity funds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Pension Benefits | Other | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	21	35
Pension Benefits | Other | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	21	35
Pension Benefits | Other | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Pension Benefits | Fixed-income holdings | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	1,377,514	961,193
Pension Benefits | Fixed-income holdings | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	166,715	143,604
Pension Benefits | Fixed-income holdings | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	1,210,798	817,589
Pension Benefits | U.S. Treasuries | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	110,767	94,128
Pension Benefits | U.S. Treasuries | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	110,766	94,128
Pension Benefits | U.S. Treasuries | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Pension Benefits | Federal agencies | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	11,028	11,054
Pension Benefits | Federal agencies | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Pension Benefits | Federal agencies | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	11,028	11,054
Pension Benefits | Corporate bonds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	708,790	640,875
Pension Benefits | Corporate bonds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Pension Benefits | Corporate bonds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	708,790	640,875
Pension Benefits | Pooled fixed income funds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	442,409	111,649
Pension Benefits | Pooled fixed income funds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	55,487	49,472
Pension Benefits | Pooled fixed income funds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	386,922	62,177
Pension Benefits | Foreign bonds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	93,034	93,112
Pension Benefits | Foreign bonds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	462	4
Pension Benefits | Foreign bonds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	92,572	93,108
Pension Benefits | Municipal bonds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	11,486	10,375
Pension Benefits | Municipal bonds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Pension Benefits | Municipal bonds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	11,486	10,375
Pension Benefits | Private equity investments | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Total benefit plan assets	794	799
Pension Benefits | Real estate investments | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Total benefit plan assets	1,592	3,010
Postretirement Healthcare Benefits
Defined Benefit Plan Disclosure
Total benefit plan assets	225,167	205,803	$ 262,945
Postretirement Healthcare Benefits | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	210,450	190,597
Postretirement Healthcare Benefits | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	204,138	180,126
Postretirement Healthcare Benefits | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	6,312	10,471
Postretirement Healthcare Benefits | Cash and cash equivalents | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	2,391	7,998
Postretirement Healthcare Benefits | Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	2,391	7,998
Postretirement Healthcare Benefits | Equity Holdings | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	160,529	139,984
Postretirement Healthcare Benefits | Equity Holdings | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	160,529	139,984
Postretirement Healthcare Benefits | Equity Holdings | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | U.S. companies | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	113,135	95,014
Postretirement Healthcare Benefits | U.S. companies | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	113,135	95,014
Postretirement Healthcare Benefits | U.S. companies | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Foreign companies | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	21,034	20,784
Postretirement Healthcare Benefits | Foreign companies | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	21,034	20,784
Postretirement Healthcare Benefits | Foreign companies | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Pooled equity funds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	26,355	24,181
Postretirement Healthcare Benefits | Pooled equity funds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	26,355	24,181
Postretirement Healthcare Benefits | Pooled equity funds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Other | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	5	5
Postretirement Healthcare Benefits | Other | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	5	5
Postretirement Healthcare Benefits | Other | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Fixed-income holdings | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	47,530	42,615
Postretirement Healthcare Benefits | Fixed-income holdings | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	43,609	40,142
Postretirement Healthcare Benefits | Fixed-income holdings | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	3,921	2,473
Postretirement Healthcare Benefits | U.S. Treasuries | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	359	287
Postretirement Healthcare Benefits | U.S. Treasuries | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	359	287
Postretirement Healthcare Benefits | U.S. Treasuries | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Federal agencies | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	36	34
Postretirement Healthcare Benefits | Federal agencies | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Federal agencies | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	36	34
Postretirement Healthcare Benefits | Corporate bonds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	2,286	1,938
Postretirement Healthcare Benefits | Corporate bonds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Corporate bonds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	2,286	1,938
Postretirement Healthcare Benefits | Pooled fixed income funds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	44,512	40,043
Postretirement Healthcare Benefits | Pooled fixed income funds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	43,248	39,855
Postretirement Healthcare Benefits | Pooled fixed income funds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	1,264	188
Postretirement Healthcare Benefits | Foreign bonds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	300	282
Postretirement Healthcare Benefits | Foreign bonds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	2	0
Postretirement Healthcare Benefits | Foreign bonds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	298	282
Postretirement Healthcare Benefits | Municipal bonds | Fair Value, Inputs, Level 1 and 2
Defined Benefit Plan Disclosure
Total benefit plan assets	37	31
Postretirement Healthcare Benefits | Municipal bonds | Level 1
Defined Benefit Plan Disclosure
Total benefit plan assets	0	0
Postretirement Healthcare Benefits | Municipal bonds | Level 2
Defined Benefit Plan Disclosure
Total benefit plan assets	37	31
Postretirement Healthcare Benefits | Private equity investments | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Total benefit plan assets	13,773
Postretirement Healthcare Benefits | Limited partnership interests | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Total benefit plan assets		13,502
Postretirement Healthcare Benefits | Real estate investments | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Total benefit plan assets	$ 944	$ 1,704