v3.26.1
Income taxes - Schedule of Composition of Effective Tax Rates (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Effective Income Tax Rate Reconciliation [Line Items]        
Income (loss) before income taxes $ 87.4 $ 22.3 $ 89.4 $ 37.8
Income tax expense $ 7.4 $ 9.2 $ 13.5 $ 16.9
Effective tax rate 8.50% 41.30% 15.10% 44.70%
Tax-paying entities        
Effective Income Tax Rate Reconciliation [Line Items]        
Income (loss) before income taxes $ 29.7 $ 42.8 $ 48.8 $ 97.0
Income tax expense $ 7.4 $ 9.2 $ 13.5 $ 16.9
Effective tax rate 24.90% 21.50% 27.70% 17.40%
Non-tax paying entities        
Effective Income Tax Rate Reconciliation [Line Items]        
Income (loss) before income taxes $ 57.7 $ (20.5) $ 40.6 $ (59.2)
Income tax expense $ 0.0 $ 0.0 $ 0.0 $ 0.0
Effective tax rate 0.00% 0.00% 0.00% 0.00%