v3.26.1
Fair value measurements - Schedule of Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Level 1 | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-qualified deferred compensation plan assets $ 7 $ 7
Non-qualified deferred compensation plan liabilities 7 7
Level 2 | 5.25% Senior Notes Due July 2030    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 499 505
Level 2 | Fair Value, Recurring | Interest Rate Contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate derivative financial instrument assets 10 3
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 5,693 5,567
Kloosterboer Preference Shares 280 279
Level 3 | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquisition related contingent consideration 12 14
Level 3 | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments (included in other assets) $ 27 $ 26