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Financial Instruments - Additional Information (Details) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 CAD ($) day | Dec. 31, 2019 CAD ($) day | Dec. 31, 2020 USD ($) day | Dec. 31, 2020 AUD ($) day
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Maximum amount of credit risk exposure | $ 1,649,600,000 | $ 1,682,400,000 |  |
Number of internal target days of revenue in trade receivables | day | 58 | 61 | 58 | 58
Decrease through write-off, financial assets | $ 2,000,000.0 | $ 1,700,000 |  |
Percentage of changes in equity prices | 1.00% |  | 1.00% | 1.00%
Equity price risk |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Net income increase (decrease) | $ 1,300,000 |  |  |
Revolving credit facility |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Amount of revolving credit facility | 800,000,000.0 |  |  | $ 800.0
Unused capacity of the facility | 786,500,000 | 282,600,000 |  |
Forward contract |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Unrealized loss on forward contract | 500,000 |  |  |
Derivative notional amount | $ 96,000,000.0 |  | $ 75.0 |
Cash flow hedges |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Interest rate swap agreement, amount | 160,000,000.0 |  |  |
Interest rate swap agreement, fixed Interest rate | 2.295% |  | 2.295% | 2.295%
Unrealized gain (loss) on interest rate swap | $ (5,400,000) | (1,500,000) |  |
Gain (loss) on interest rate swap, net of tax | $ (4,100,000) | $ (1,100,000) |  |

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- Definition The decrease in financial assets resulting from write-off. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph IG20B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35I -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35I_c&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35H&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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