Income taxes - Other (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Reconciliation of income taxes | ||||
| Enacted statutory income tax rate | 27.00% | 27.00% | 27.00% | 27.00% |
| Tax expense | $ 2.5 | $ 0.2 | $ 5.2 | $ 2.4 |
| Computed income tax (benefit) expense at Canadian statutory rate | 5.5 | 3.9 | 11.5 | 5.9 |
| Impact related to change in estimates | 2.7 | |||
| Other permanent differences | 0.2 | 0.9 | 0.7 | |
| Impact related to withholding federal and state taxes | 1.1 | 0.5 | 1.7 | 1.3 |
| Valuation allowance | 133.8 | 133.8 | ||
| Increase (decrease) in the valuation allowance | (2.7) | (4.4) | (11.6) | (4.5) |
| Foreign exchange | 1.4 | 1.0 | ||
| Canada | ||||
| Reconciliation of income taxes | ||||
| Increase (decrease) in the valuation allowance | 0.2 | (1.0) | (3.6) | 4.4 |
| United States | ||||
| Reconciliation of income taxes | ||||
| Increase (decrease) in the valuation allowance | $ (2.9) | $ (3.4) | $ (8.0) | $ (8.9) |
| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to change in estimates due to tax filings. No definition available.
|
| X | ||||||||||
- Definition The portion of the difference between total income tax expense or benefit as reported in the income statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to total foreign exchange effect on income tax expense or benefit. No definition available.
|
| X | ||||||||||
- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for withholding taxes of federal and state taxes. No definition available.
|
| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|