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Capital Stock (Shares Repurchased) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 2 Months Ended | 12 Months Ended | 156 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 27, 2020 | Mar. 31, 2020 | May 27, 2020 | Feb. 02, 2016 | Feb. 01, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Share repurchase plan, authorized amount |  |  |  | $ 468.0 | $ 300.0
Common shares repurchased, value |  | $ 3.8 |  |  |
Subsequent Event |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common shares repurchased, value |  |  | $ 288.1 |  |
Share repurchase plan, remaining capacity | $ 179.9 |  | $ 179.9 |  |
Class A Voting Common Shares |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common shares repurchased, number of shares |  | 0.7 |  |  |
Common shares repurchased, value |  | $ 3.8 |  |  |
Common shares repurchased, average cost per share |  | $ 5.43 |  |  |
Class A Voting Common Shares | Subsequent Event |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common shares repurchased, value | $ 1.0 |  |  |  |

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