|
Equity method investments (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Operating results | ||||
| Project revenue | $ 50.6 | $ 51.6 | $ 157.7 | $ 158.5 |
| Project expenses | 39.4 | 48.1 | 128.3 | 138.9 |
| Project other income (expense) | 27.9 | 0.5 | 25.6 | (7.2) |
| Project income | 39.1 | 4.0 | 55.0 | 12.4 |
|
Chambers
|
||||
| Operating results | ||||
| Project revenue | 13.4 | 12.2 | 40.0 | 40.1 |
| Project expenses | 10.1 | 9.6 | 30.8 | 28.1 |
| Project other income (expense) | (0.7) | 0.2 | (1.8) | (1.4) |
| Project income | 2.6 | 2.8 | 7.4 | 10.6 |
|
Other
|
||||
| Operating results | ||||
| Project revenue | 37.2 | 39.4 | 117.7 | 118.4 |
| Project expenses | 29.3 | 38.5 | 97.5 | 110.8 |
| Project other income (expense) | 28.6 | 0.3 | 27.4 | (5.8) |
| Project income | $ 36.5 | $ 1.2 | $ 47.6 | $ 1.8 |