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Capital Stock - Director SBC Included in the Income Statement (Details) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) shares $ / shares | Dec. 31, 2022 USD ($) shares $ / shares | Dec. 31, 2021 USD ($) shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Director SBC expense in SG&A | $ | $ 55.6 | $ 51.0 | $ 33.4
RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of awards (in millions) (in shares) | 2.0 | 2.0 | 3.0
Weighted average grant date fair value per unit (in usd per share) | $ / shares | $ 13.20 | $ 12.17 | $ 8.36
Number of shares outstanding (in shares) | 3.2 | 3.8 | 4.6
Director |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Director SBC expense in SG&A | $ | $ 2.4 | $ 2.2 | $ 2.1
Director | DSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of awards (in millions) (in shares) | 0.1 | 0.1 | 0.1
Weighted average grant date fair value per unit (in usd per share) | $ / shares | $ 17.72 | $ 10.18 | $ 8.98
Number of shares outstanding (in shares) | 1.1 | 2.1 | 2.2
Director | RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of awards (in millions) (in shares) | $ / shares | 20,000.00 | 40,000.00 | 50,000.00
Weighted average grant date fair value per unit (in usd per share) | $ / shares | $ 18.15 | $ 10.44 | $ 8.92
Number of shares outstanding (in shares) | 0.1 | 0.1 | 0.1

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- Definition The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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