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Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 158 Months Ended |
--- | --- | --- | --- | ---
May 07, 2020 | Jun. 30, 2020 | Aug. 06, 2020 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchases of common shares, value |  | $ 1.0 |  |
Class A Voting Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized common shares (in shares) |  | 500.0 |  | 500.0
Repurchases of common shares, shares |  | 0.2 |  |
Repurchases of common shares, value |  | $ 1.0 |  |
Repurchases of common shares, weighted average repurchase price per share |  | $ 5.75 |  |
Class B Non-Voting Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized common shares (in shares) |  | 500.0 |  | 500.0
Subsequent Event |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchases of common shares, value |  |  | $ 288.1 |
Share repurchase program, remaining authorized repurchase amount |  |  | $ 179.9 |
Options and SARs, existing | Class A Voting Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards exchanged (in shares) | 1.1 |  |  |
Options and SARs, existing | Class B Non-Voting Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards exchanged (in shares) | 4.3 |  |  |
Options and SARs, new | Class A Voting Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards exchanged (in shares) | 0.1 |  |  |
Awards exchanged, exercise price (in USD per share) | $ 7.70 |  |  |
Options and SARs, new | Class B Non-Voting Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards exchanged (in shares) | 0.8 |  |  |
Awards exchanged, exercise price (in USD per share) | $ 7.13 |  |  |

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