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Capital Stock - PSU Measurement Inputs (Details) - PSUs | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expected volatility | 49.00% | 30.00% | 28.00%
Expected life | 3 years | 3 years | 3 years
Risk-free interest rate (based on 3-year Treasury bonds) | 0.20% | 1.40% | 2.50%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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