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Common Shareholders' Equity (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2017 shares | Nov. 30, 2009 shares | Dec. 31, 2024 USD ($) vote $ / shares shares | Dec. 31, 2022 USD ($)
Share repurchases |  |  |  |
Purchase price | $ |  |  | $ 55 | $ 43
Treasury shares |  |  |  |
Share repurchases |  |  |  |
Purchase price | $ |  |  | $ 55 | $ 43
Series A Common Shares |  |  |  |
Common shareholders' equity, other disclosures |  |  |  |
Number of votes | vote |  |  | 10 |
Voting rights for number of board of directors |  |  | 75% |
Common Shares |  |  |  |
Share repurchases |  |  |  |
Stock Repurchase Program Additional Number Of Shares Authorized To Be Repurchased Per Year |  | 1,300,000 |  |
Repurchase of Common Shares |  |  | 939,999 |
Purchase price | $ |  |  | $ 55 |
Average cost per share | $ / shares |  |  | $ 58.06 |
Repurchase authorization, cumulative shares authorized (in shares) |  |  | 986,942 |
Common shareholders' equity, other disclosures |  |  |  |
Number of votes | vote |  |  | 1 |
Voting rights for number of board of directors |  |  | 25% |
Common Shares | Maximum |  |  |  |
Share repurchases |  |  |  |
Stock Repurchase Program Additional Number Of Shares Authorized To Be Repurchased Per Year | 1,300,000 |  |  |
Common Shares | Minimum |  |  |  |
Share repurchases |  |  |  |
Stock Repurchase Program Additional Number Of Shares Authorized To Be Repurchased Per Year | 0 |  |  |
Common Shares | 401(k) |  |  |  |
Common shareholders' equity, other disclosures |  |  |  |
Shares reserved (in shares) |  |  | 962,000 |

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