v3.26.1
Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
As of $ 4,766,804 $ 4,827,327 $ 4,325,765 $ 4,286,815 $ 4,827,327 $ 4,286,815
Other Comprehensive (Loss) Income, Net of Tax (161,649) (6,342) 31,990 13,096 (167,991) 45,086
As of 4,796,100 4,766,804 4,384,554 $ 4,325,765 4,796,100 4,384,554
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         (72,054)  
Net amount reclassified from accumulated other comprehensive income (loss)         (95,937)  
Other Comprehensive (Loss) Income, Net of Tax         (167,991)  
As of 419,089       419,089  
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 125   32,283   (6,123) 46,550
Net amount reclassified from accumulated other comprehensive income (loss) 6,175   646   6,175 646
Other Comprehensive (Loss) Income, Net of Tax 6,300   32,929   52 47,196
As of (12,210)       (12,210)  
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         (66,535)  
Net amount reclassified from accumulated other comprehensive income (loss) (101,889)   (670)   (102,446) (1,338)
Other Comprehensive (Loss) Income, Net of Tax (168,424)   (670)   (168,981) (1,338)
As of 432,083       432,083  
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         604  
Net amount reclassified from accumulated other comprehensive income (loss)         334  
Other Comprehensive (Loss) Income, Net of Tax 475   $ (269)   938 $ (772)
As of $ (784)       $ (784)