v3.26.3
Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of $ 4,796,100 $ 4,766,804 $ 4,827,327 $ 4,384,554 $ 4,325,765 $ 4,286,815 $ 4,827,327 $ 4,286,815
Other Comprehensive Income (Loss), Net of Tax 25,788 (161,649) (6,342) (8,849) 31,990 13,096 (142,203) 36,237
As of 4,812,188 $ 4,796,100 4,766,804 4,488,660 $ 4,384,554 $ 4,325,765 4,812,188 4,488,660
AOCI Including Portion Attributable to Noncontrolling Interest [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of     587,080       587,080  
Other comprehensive (loss) income before reclassifications             (34,811)  
Net amount reclassified from accumulated other comprehensive income (loss)             (107,392)  
Other Comprehensive Income (Loss), Net of Tax             (142,203)  
As of 444,877           444,877  
Cumulative Foreign Currency Translation Adjustment [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of     (12,262)       (12,262)  
Other comprehensive (loss) income before reclassifications 3,309     (8,227)     (2,814) 38,323
Net amount reclassified from accumulated other comprehensive income (loss)             6,175 646
Other Comprehensive Income (Loss), Net of Tax             3,361 38,969
As of (8,901)           (8,901)  
Unrealized Gain on Pensions and Other Postretirement Plans [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of     601,064       601,064  
Other comprehensive (loss) income before reclassifications             (33,156)  
Net amount reclassified from accumulated other comprehensive income (loss) (11,619)     (669)     (114,065) (2,007)
Other Comprehensive Income (Loss), Net of Tax 21,760     (669)     (147,221) (2,007)
As of 453,843           453,843  
Cash Flow Hedges [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of     $ (1,722)       (1,722)  
Other comprehensive (loss) income before reclassifications             1,159  
Net amount reclassified from accumulated other comprehensive income (loss)             498  
Other Comprehensive Income (Loss), Net of Tax 719     $ 47     1,657 $ (725)
As of $ (65)           $ (65)