|
Income taxes - Income and Taxes from Cont. Operations (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Income (loss) from continuing operations before income taxes [Abstract] | ||||
| Income from continuing operations before tax | $ 22.0 | $ 15.6 | $ 62.0 | $ 51.2 |
| Income tax expense (benefit) from continuing operations [Abstract] | ||||
| Deferred income taxes | (32.9) | (11.2) | ||
| Provision (benefit) for income taxes | $ (10.1) | $ 5.6 | $ 6.1 | $ 17.0 |