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Capital Stock - Schedule of Capital Transactions (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number Of Shares Outstanding [Roll Forward] |  |  |  |
Proceeds from exercise of options | $ 0.0 | $ 0.0 | $ 0.4 |
Subordinate voting shares |  |  |  |
Number Of Shares Outstanding [Roll Forward] |  |  |  |
Number of shares issued, beginning balance (in shares) | 110,200,000 | 117,700,000 | 123,200,000 |
Issued from treasury (in shares) | 300,000 | 800,000 | 1,300,000 |
Cancelled under NCIB (in shares) | (6,200.0000) | (8,300,000) | (6,800,000) |
Other (in shares) | 0 | 0 | 346,175 |
Number of shares issued, ending balance (in shares) | 110,500,000 | 110,200,000 | 117,700,000 |
Number of shares outstanding | 110,500,000 | 110,200,000 | 117,700,000 | 123,200,000
MVS |  |  |  |
Number Of Shares Outstanding [Roll Forward] |  |  |  |
Number of shares issued, beginning balance (in shares) | 18,600,000 | 18,600,000 | 18,600,000 |
Issued from treasury (in shares) | 0 | 0 | 0 |
Cancelled under NCIB (in shares) | 0 | 0 | 0 |
Number of shares issued, ending balance (in shares) | 18,600,000 | 18,600,000 | 18,600,000 |
Number of shares outstanding | 18,600,000 | 18,600,000 | 18,600,000 | 18,600,000
Options | Subordinate voting shares |  |  |  |
Number Of Shares Outstanding [Roll Forward] |  |  |  |
Shares issued (in shares) | 0 | 0 | 100,000 |
RSUs | Subordinate voting shares |  |  |  |
Number Of Shares Outstanding [Roll Forward] |  |  |  |
Shares issued (in shares) | 300,000 | 800,000 | 1,200,000 |
Value of shares issued upon vesting of RSUs | $ 2.2 | $ 10.4 | $ 14.3 |

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