v3.20.1
Segment and geographic information - EBITDA (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2020
USD ($)
segment
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment and geographic information      
Number of reportable segments | segment 4    
Project revenues $ 72.8 $ 73.0  
Segment assets 882.0 1,027.0 $ 935.6
Project Adjusted EBITDA 50.8 53.7  
Change in fair value of derivative instruments 5.6 2.4  
Depreciation and amortization 19.8 20.2  
Interest, net 0.7 0.7  
Other project income   (0.2)  
Project income 24.7 30.6  
Administration 6.7 6.8  
Interest expense, net 10.8 11.1  
Foreign exchange (gain) loss (20.6) 5.0  
Other income (expenses), net 2.6 4.7  
Income from operations before income taxes 25.2 3.0  
Income tax expense 1.5 0.6  
Net income (loss) 23.7 2.4  
Solid Fuel      
Segment and geographic information      
Project revenues 23.4 19.8  
Segment assets 225.0 267.7  
Project Adjusted EBITDA 7.8 10.1  
Depreciation and amortization 5.6 5.9  
Interest, net 0.7 0.7  
Project income 1.5 3.5  
Income from operations before income taxes 1.5 3.5  
Net income (loss) 1.5 3.5  
Natural Gas      
Segment and geographic information      
Project revenues 30.8 34.6  
Segment assets 230.6 275.9  
Project Adjusted EBITDA 28.2 28.1  
Change in fair value of derivative instruments (0.5) 0.6  
Depreciation and amortization 9.2 9.3  
Other project income   (0.2)  
Project income 19.5 18.4  
Income from operations before income taxes 19.5 18.4  
Net income (loss) 19.5 18.4  
Hydroelectric      
Segment and geographic information      
Project revenues 18.4 18.4  
Segment assets 359.5 384.0  
Project Adjusted EBITDA 15.3 15.6  
Depreciation and amortization 4.9 4.9  
Project income 10.4 10.7  
Income from operations before income taxes 10.4 10.7  
Net income (loss) 10.4 10.7  
Corporate      
Segment and geographic information      
Project revenues 0.2 0.2  
Segment assets 66.9 99.4  
Project Adjusted EBITDA (0.5) (0.1)  
Change in fair value of derivative instruments 6.1 1.8  
Depreciation and amortization 0.1 0.1  
Project income (6.7) (2.0)  
Administration 6.7 6.8  
Interest expense, net 10.8 11.1  
Foreign exchange (gain) loss (20.6) 5.0  
Other income (expenses), net 2.6 4.7  
Income from operations before income taxes (6.2) (29.6)  
Income tax expense 1.5 0.6  
Net income (loss) $ (7.7) $ (30.2)