XML 139 R111.htm IDEA: XBRL DOCUMENT
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Long-Term Debt - Additional Information (Detail) $ in Millions |  |  | 8 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 05, 2017 CAD | May 06, 2016 CAD Tranches | Dec. 31, 2017 CAD | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 06, 2016 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Revolving credit facilities amount |  | CAD 1,250,000,000 |  |  |  |  |  |  |  |
Number of tranches | Tranches |  | 3 |  |  |  |  |  |  |  |
Additional revolving credit facilities amount |  | CAD 200,000,000 |  |  |  |  |  |  |  |
Credit facility average interest rate |  |  |  | 3.20% | 3.20% | 3.13% | 3.13% |  |  |
Letter of credit issued |  |  |  | CAD 51,800,000 |  | CAD 54,700,000 |  |  |  |
Letter of credit outstanding |  |  | CAD 51,800,000 | 51,800,000 |  | 54,700,000 |  |  |  |
Letter of credit issued and outstanding in addition |  |  |  | 4,300,000 |  | 3,600,000 |  |  |  |
US funds [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility payable |  |  |  | 106,900,000 | $ 85.0 | 114,100,000 | $ 85.0 |  |  |
Term loan payable |  |  |  | 460,000,000 |  | 156,700,000 | $ 116.7 |  |  |
Bonds issued under surety facilities |  |  | 587,100,000 | 587,100,000 |  | 430,600,000 |  | $ 467.0 | $ 320.7 |
Canadian funds [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility payable |  |  |  | 103,000,000 |  | 302,000,000 |  |  |  |
Term loan payable |  |  |  | 300,000,000 |  |  |  |  |  |
Bonds issued under surety facilities |  |  | CAD 200,000 | CAD 200,000 |  | 200,000 |  |  |  |
Foreign currencies [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Bonds issued under surety facilities |  |  |  |  |  | CAD 1,000,000 |  |  | $ 1.3 |
Canadian prime rate and US base rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowing, interest rate basis |  |  |  | CAD: prime rate loan or a banker's acceptance, USD: US base rate or LIBOR advance, Sterling or Euro: LIBRO advance | CAD: prime rate loan or a banker's acceptance, USD: US base rate or LIBOR advance, Sterling or Euro: LIBRO advance |  |  |  |  |
Bottom of range [member] | Canadian prime rate and US base rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Basis point |  |  | 0.00% | 0.00% |  |  |  | 0.00% |  |
Bottom of range [member] | Bankers acceptance rate, LIBOR rate, and letter of credit rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Basis point |  |  | 1.00% | 1.00% |  |  |  | 1.00% |  |
Top of range [member] | Canadian prime rate and US base rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Basis point |  |  | 1.75% | 1.75% |  |  |  | 1.75% |  |
Top of range [member] | Bankers acceptance rate, LIBOR rate, and letter of credit rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Basis point |  |  | 2.75% | 2.75% |  |  |  | 2.75% |  |
Notes payable [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Weighted average rate of interest |  |  | 3.46% | 3.46% |  | 3.45% |  | 3.46% | 3.45% |
Aggregate maturity value of notes |  |  | CAD 61,900,000 | CAD 61,900,000 |  | CAD 129,400,000 |  |  |  |
Carrying amount of notes payable |  |  | 57,400,000 | 57,400,000 |  | CAD 122,300,000 |  | $ 45.7 | $ 91.1 |
Revolving credit facilities [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Revolving credit facilities amount |  | CAD 800,000,000 | CAD 800,000,000 | CAD 800,000,000 |  |  |  |  |  |
Agreement expiry date | May 06, 2021 | May 06, 2020 | May 06, 2021 |  |  |  |  |  |  |
Term loan [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Revolving credit facilities amount |  | CAD 450,000,000 |  |  |  |  |  |  |  |
Transaction costs |  | 3,300,000 |  |  |  |  |  |  |  |
Term loan tranche A [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Agreement expiry date |  |  |  | May 06, 2018 | May 06, 2018 |  |  |  |  |
Drawn borrowing facilities |  | 150,000,000 |  |  |  |  |  |  |  |
Term loan tranche B [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Agreement expiry date |  |  |  | May 06, 2019 | May 06, 2019 |  |  |  |  |
Drawn borrowing facilities |  | CAD 150,000,000 |  |  |  |  |  |  |  |
Term loan tranche C [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Agreement expiry date |  |  |  | May 06, 2021 | May 06, 2021 |  |  |  |  |
Drawn borrowing facilities | CAD 160,000,000 |  |  |  |  |  |  |  |  | $ 116.7
Finance lease obligations [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 1.40% | 1.40% |  | 1.37% |  | 1.40% | 1.37% |
Finance lease obligations [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.25% | 5.25% |  | 5.93% |  | 5.25% | 5.93% |

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