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Retirement benefits - Schedule of Assets Held In Retirement Benefit Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 2,041,696 $ 1,888,853 $ 1,973,539
Other benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets 241,903 217,890 $ 207,372
Fair value measurements on a recurring basis | Pension benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets 2,042,000 1,889,000  
Fair value measurements on a recurring basis | Pension benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 2,039,000 1,887,000  
Fair value measurements on a recurring basis | Pension benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,303,000 1,233,000  
Fair value measurements on a recurring basis | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   546,000  
Fair value measurements on a recurring basis | Pension benefits | Cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 3,000 2,000  
Fair value measurements on a recurring basis | Other benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets 242,000 218,000  
Fair value measurements on a recurring basis | Other benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 241,000 217,000  
Fair value measurements on a recurring basis | Other benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 169,000 154,000  
Fair value measurements on a recurring basis | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   52,000  
Fair value measurements on a recurring basis | Other benefits | Cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,000 1,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 437,000 403,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 23,000 20,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 487,000 484,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 596,000    
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 49,000 48,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 3,000 2,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 69,000 63,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 56,000    
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,700,000 1,634,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,303,000 1,233,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 437,000 403,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 23,000 20,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 487,000 484,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Non-U.S. equity index and ETFs      
Fair value measurements on a recurring basis      
Fair value of plan assets 356,000 326,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 397,000 401,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Cash equivalents, fund and at NAV      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 193,000 186,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 169,000 154,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 49,000 48,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 3,000 2,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 69,000 63,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Non-U.S. equity index and ETFs      
Fair value measurements on a recurring basis      
Fair value of plan assets 48,000 41,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 24,000 22,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Cash equivalents, fund and at NAV      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 10,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 199,000 145,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 199,000 145,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 32,000 30,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 32,000 30,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets 140,000 108,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S. equity index and ETFs      
Fair value measurements on a recurring basis      
Fair value of plan assets 356,000 326,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 78,000 63,000  
Unfunded commitments $ 107,000 122,000  
Dissolution written notice period (in months) 6 months    
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents, fund and at NAV      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 62,000 45,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 62,000 $ 45,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents | Minimum      
Fair value measurements on a recurring basis      
Redemption notice period 0 days 0 days  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents | Maximum      
Fair value measurements on a recurring basis      
Redemption notice period 1 day 1 day  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 16,000 $ 1,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S. equity index and ETFs      
Fair value measurements on a recurring basis      
Fair value of plan assets 48,000 41,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,000 1,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents, fund and at NAV      
Fair value measurements on a recurring basis      
Fair value of plan assets 15,000 10,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 15,000 $ 0  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents | Minimum      
Fair value measurements on a recurring basis      
Redemption notice period 0 days 0 days  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents | Maximum      
Fair value measurements on a recurring basis      
Redemption notice period 1 day 1 day