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Income Taxes - Additional Informations (Detail) CAD in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 | Dec. 31, 2017 USD ($)
Disclosure of income tax [line items] |  |  |  |  |
Corporate tax rate |  | 27.00% | 27.00% | 27.00% |
Transition tax related to US tax reform |  | CAD 31.2 | $ 24.5 |  |
Foreign tax credits |  | 9.1 |  |  | $ 7.1
Net transition tax liability payable |  | CAD 20.2 |  |  | $ 15.9
Net transition tax liability payable period |  | 8 years | 8 years |  |
Deferred income tax expense for changes in tax rate |  | CAD 12.6 | $ 9.9 |  |
United States [member] |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |
Corporate tax rate |  | 35.00% | 35.00% |  |
United States [member] | 2018 to 2022 [member] |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |
Federal tax due, net of foreign tax credits, percentage |  | 8.00% |  |  | 8.00%
United States [member] | 2023 [member] |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |
Federal tax due, net of foreign tax credits, percentage |  | 15.00% |  |  | 15.00%
United States [member] | 2024 [member] |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |
Federal tax due, net of foreign tax credits, percentage |  | 20.00% |  |  | 20.00%
United States [member] | 2025 [member] |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |
Federal tax due, net of foreign tax credits, percentage |  | 25.00% |  |  | 25.00%
Federal transition tax related to US tax reform [member] |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |
Transition tax related to US tax reform |  | CAD 29.3 | $ 23.0 |  |
State transition tax related to US tax reform [member] |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |
Net transition tax liability payable |  | CAD 1.9 | $ 1.5 |  |
Scenario, forecast [member] | United States [member] |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |
Corporate tax rate | 21.00% |  |  |  |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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