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Segment and geographic information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment and geographic information          
Number of Reportable Segments | segment     4    
Project revenues $ 98.2 $ 103.1 $ 204.6 $ 214.4  
Segment assets 1,721.3 2,299.9 1,721.3 2,299.9 $ 1,671.2
Net income (loss) from continuing operations (16.3) (20.0) (29.3) 4.7  
Income tax expense (benefit) (18.4) 2.9 (16.8) (1.7)  
Income (loss) from continuing operations before income taxes (34.7) (17.1) (46.1) 3.0  
Administration 5.8 6.6 11.9 16.0  
Interest, net 51.2 24.6 67.8 50.3  
Foreign exchange loss (gain) 2.6 4.8 22.5 (27.4)  
Other income, net 0.3 (1.7) (2.2) (3.1)  
Project income 25.2 17.2 53.9 38.8  
Change in fair value of derivative instruments (12.2) (6.9) (11.0) (5.1)  
Depreciation and amortization 30.4 33.3 60.3 66.1  
Interest, net 2.9 2.5 5.4 4.9  
Other project expense (income) (0.1) (2.2) 0.1 (2.2)  
Project Adjusted EBITDA 46.2 43.9 108.7 102.5  
East U.S.          
Segment and geographic information          
Project revenues 33.7 38.9 73.1 76.5  
Segment assets 787.1 858.6 787.1 858.6  
Net income (loss) from continuing operations 9.6 16.7 25.6 28.0  
Income (loss) from continuing operations before income taxes 9.6 16.7 25.6 28.0  
Project income 9.6 16.7 25.6 28.0  
Change in fair value of derivative instruments (2.5) (3.0) (1.7) (0.4)  
Depreciation and amortization 10.9 10.8 21.9 21.2  
Interest, net 2.9 2.5 5.4 4.9  
Project Adjusted EBITDA 20.9 27.0 51.2 53.7  
West U.S.          
Segment and geographic information          
Project revenues 25.5 26.3 44.5 49.3  
Segment assets 335.9 375.8 335.9 375.8  
Net income (loss) from continuing operations 4.6 (4.3) 2.3 (4.0)  
Income (loss) from continuing operations before income taxes 4.6 (4.3) 2.3 (4.0)  
Project income 4.6 (4.3) 2.3 (4.0)  
Depreciation and amortization 9.9 10.0 19.7 19.6  
Project Adjusted EBITDA 14.5 5.7 22.0 15.6  
Canada          
Segment and geographic information          
Project revenues 38.8 37.7 86.5 88.2  
Segment assets 430.3 612.8 430.3 612.8  
Net income (loss) from continuing operations 12.9 2.8 29.3 16.0  
Income (loss) from continuing operations before income taxes 12.9 2.8 29.3 16.0  
Project income 12.9 2.8 29.3 16.0  
Change in fair value of derivative instruments (11.6) (3.9) (12.1) (5.5)  
Depreciation and amortization 9.6 12.7 18.5 24.9  
Project Adjusted EBITDA 10.9 11.6 35.7 35.4  
Un-Allocated Corporate          
Segment and geographic information          
Project revenues 0.2 0.2 0.5 0.4  
Segment assets 168.0 452.7 168.0 452.7  
Net income (loss) from continuing operations (43.4) (35.2) (86.5) (35.3)  
Income tax expense (benefit) (18.4) 2.9 (16.8) (1.7)  
Income (loss) from continuing operations before income taxes (61.8) (32.3) (103.3) (37.0)  
Administration 5.8 6.6 11.9 16.0  
Interest, net 51.2 24.6 67.8 50.3  
Foreign exchange loss (gain) 2.6 4.8 22.5 (27.4)  
Other income, net 0.3 (1.7) (2.2) (3.1)  
Project income (1.9) 2.0 (3.3) (1.2)  
Change in fair value of derivative instruments 1.9   2.8 0.8  
Depreciation and amortization   (0.2) 0.2 0.4  
Other project expense (income) (0.1) (2.2) 0.1 (2.2)  
Project Adjusted EBITDA $ (0.1) $ (0.4) $ (0.2) $ (2.2)