v3.26.1
Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Total debt, gross $ 687.6 $ 700.6
Deferred finance charges (10.1) (11.4)
Total debt, net of deferred finance charges 677.5 689.2
Less: Current portion of long-term debt, net of deferred finance charges (24.1) (23.6)
Long-term debt 653.4 665.6
Sale and Leaseback Facility | Vessel financing (Mount Norefjell)    
Debt Instrument [Line Items]    
Total debt, gross 55.2 56.2
Sale and Leaseback Facility | Vessel financing (Mount Ita)    
Debt Instrument [Line Items]    
Total debt, gross 55.2 56.2
Sale and Leaseback Facility | Vessel financing (Mount Etna)    
Debt Instrument [Line Items]    
Total debt, gross 55.6 56.8
Sale and Leaseback Facility | Vessel financing (Mount Blanc)    
Debt Instrument [Line Items]    
Total debt, gross 55.5 56.7
Sale and Leaseback Facility | Vessel financing (Mount Matterhorn)    
Debt Instrument [Line Items]    
Total debt, gross 57.2 58.3
Sale and Leaseback Facility | Vessel financing (Mount Neblina)    
Debt Instrument [Line Items]    
Total debt, gross 57.3 58.3
Sale and Leaseback Facility | Vessel financing (Mount Hua)    
Debt Instrument [Line Items]    
Total debt, gross 58.4 59.5
Sale and Leaseback Facility | Vessel financing (Mount Bandeira)    
Debt Instrument [Line Items]    
Total debt, gross 58.4 59.5
Sale and Leaseback Facility | Vessel financing (Mount Elbrus)    
Debt Instrument [Line Items]    
Total debt, gross 58.2 59.3
Sale and Leaseback Facility | Vessel financing (Mount Denali)    
Debt Instrument [Line Items]    
Total debt, gross 58.8 59.8
Sale and Leaseback Facility | Vessel financing (Mount Aconcagua)    
Debt Instrument [Line Items]    
Total debt, gross 58.9 60.0
Sale and Leaseback Facility | Vessel financing (Mount Emai)    
Debt Instrument [Line Items]    
Total debt, gross $ 58.9 $ 60.0