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Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of $ 4,384,554 $ 4,325,765 $ 4,286,815 $ 3,995,520 $ 4,070,482 $ 4,001,868 $ 4,286,815 $ 4,001,868
Other Comprehensive (Loss) Income, Net of Tax (8,849) 31,990 13,096 19,685 (5,315) (22,492) 36,237 (8,122)
As of 4,488,660 $ 4,384,554 4,325,765 4,032,430 $ 3,995,520 $ 4,070,482 4,488,660 4,032,430
AOCI Including Portion Attributable to Noncontrolling Interest [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of     334,797       334,797  
Other comprehensive income (loss) before reclassifications             37,416  
Net amount reclassified from accumulated other comprehensive income (loss)             (1,179)  
Other Comprehensive (Loss) Income, Net of Tax             36,237  
As of 371,034           371,034  
Cumulative Foreign Currency Translation Adjustment [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of     (58,044)       (58,044)  
Other comprehensive income (loss) before reclassifications (8,227)     31,469     38,323 21,702
Net amount reclassified from accumulated other comprehensive income (loss) 0     (765)     646 (765)
Other Comprehensive (Loss) Income, Net of Tax (8,227)     30,704     38,969 20,937
As of (19,075)           (19,075)  
Unrealized Gain on Pensions and Other Postretirement Plans [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of     393,949       393,949  
Other comprehensive income (loss) before reclassifications             0  
Net amount reclassified from accumulated other comprehensive income (loss) (669)     (9,559)     (2,007) (28,676)
Other Comprehensive (Loss) Income, Net of Tax (669)     (9,559)     (2,007) (28,676)
As of 391,942           391,942  
Cash Flow Hedges [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
As of     $ (1,108)       (1,108)  
Other comprehensive income (loss) before reclassifications             (907)  
Net amount reclassified from accumulated other comprehensive income (loss)             182  
Other Comprehensive (Loss) Income, Net of Tax 47     $ (1,460)     (725) $ (383)
As of $ (1,833)           $ (1,833)