v3.26.1
Fair value measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair value measurements [Line Items]    
Money market fund $ 7.1 $ 163.5
Long-term debt 1,352.2 1,429.4
Long-term debt, fair value 1,384.5 1,476.8
Significant other observable inputs (Level 2) [Member]    
Fair value measurements [Line Items]    
Long-term debt, fair value 1,384.5 1,476.8
Fair Value, Recurring [Member]    
Fair value measurements [Line Items]    
Money market fund 7.1 163.5
Fair Value, Recurring [Member] | Quoted prices in active markets for identical assets Level 1 [Member]    
Fair value measurements [Line Items]    
Money market fund 7.1 163.5
Proceeds receivable from asset sale (Note 6) [Member]    
Fair value measurements [Line Items]    
Long-term receivables 12.1  
Long-term receivables, fair value 12.0  
Proceeds receivable from asset sale (Note 6) [Member] | Significant unobservable inputs (Level 3) [Member]    
Fair value measurements [Line Items]    
Long-term receivables, fair value 12.0  
Loans and notes receivable from distributors [Member]    
Fair value measurements [Line Items]    
Long-term receivables 8.9 10.7
Long-term receivables, fair value 9.4 11.9
Loans and notes receivable from distributors [Member] | Significant unobservable inputs (Level 3) [Member]    
Fair value measurements [Line Items]    
Long-term receivables, fair value $ 9.4 $ 11.9