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Long-Term Debt - Additional Information (Details) $ in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 19, 2019 CAD ($) tranche | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 AUD ($) | Oct. 08, 2020 CAD ($) | Jan. 01, 2020 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 AUD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Number of tranches | tranche | 2 |  |  |  |  |  |  |  |
Additional revolving credit facilities amount | $ 600,000,000.0 |  |  |  |  |  |  |  |
Credit facility average interest rate |  | 2.55% | 3.77% |  |  |  |  |  |
Letter of credit outstanding |  | $ 8,800,000 | $ 49,900,000 |  |  |  |  |  |
Letter of credit issued and outstanding in addition |  | 66,200,000 | 33,300,000 |  |  |  |  |  |
Expire before 2022 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Letter of credit issued and outstanding in addition |  | 53,800,000 | 18,700,000 |  |  |  |  |  |
Open-ended terms |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Letter of credit issued and outstanding in addition |  | 12,400,000 | 14,600,000 |  |  |  |  |  |
Senior unsecured notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 300,000,000.0 |  |  |
Borrowings, interest rate |  |  |  |  |  | 2.048% |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Revolving credit facilities amount |  | 800,000,000.0 |  |  | $ 800.0 |  |  |  |
Amount available under the facility |  | 786,500,000 | 282,600,000 |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Aggregate maturity value of notes |  | 69,800,000 | 90,700,000 |  |  |  |  |  |
Notes payable | US funds |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Carrying amount of notes payable |  | 5,700,000 | 4,200,000 | $ 4.5 |  |  |  | $ 3.2 |
Notes payable | Foreign currencies |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Carrying amount of notes payable |  | 17,200,000 | 23,200,000 |  |  |  |  |  |
Notes payable | Australian funds |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Carrying amount of notes payable |  | $ 38,400,000 | $ 52,000,000.0 |  | $ 39.2 |  |  |  | $ 57.1
Notes payable | Weighted average |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 2.40% | 2.70% | 2.40% | 2.40% |  |  | 2.70% | 2.70%
Term loan |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Revolving credit facilities amount |  | $ 310,000,000.0 |  |  |  |  |  |  |
Term Loan Tranche A | Canadian funds |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Revolving credit facility payable |  | 150,000,000.0 | $ 150,000,000.0 |  |  |  |  |  |
Term Loan Tranche B | Canadian funds |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Revolving credit facility payable |  | 160,000,000.0 | 160,000,000.0 |  |  |  |  |  |
Letter of credit |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Revolving credit facilities amount |  |  |  |  |  |  | $ 100,000,000.0 |  |
Surety facilities |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Bonds issued under surety facilities |  | 155,100,000 | 380,600,000 | $ 121.8 |  |  |  | $ 293.0 |
Surety facilities expiring before September 2026 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Bonds issued under surety facilities |  | $ 12,000,000.0 | $ 11,500,000 |  |  |  |  |  |

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