|
Segment and geographic information (Details 2) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Dec. 31, 2012
|
|
| Revenue and Assets | |||||
| Project Revenue | $ 141.8 | $ 106.3 | $ 421.0 | $ 326.4 | |
| Property, plant, and equipment, net | 1,873.9 | 1,873.9 | 2,055.5 | ||
|
United States
|
|||||
| Revenue and Assets | |||||
| Project Revenue | 98.0 | 61.0 | 264.7 | 171.9 | |
| Property, plant, and equipment, net | 1,368.0 | 1,368.0 | 1,504.8 | ||
|
Canada
|
|||||
| Revenue and Assets | |||||
| Project Revenue | 43.8 | 45.3 | 156.3 | 154.5 | |
| Property, plant, and equipment, net | $ 505.9 | $ 505.9 | $ 550.7 | ||