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v3.19.3.a.u2

Share Capital - Changes in Number of Shares of Class A Stock Outstanding (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 05, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 0.12 | $ 0.12 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.46 | $ 0.44 |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Class A Stock outstanding, beginning of year |  |  |  | 12,941,809 |  |  |  | 13,139,203 | 12,941,809 | 13,139,203 |  |
Issued pursuant to shared-based compensation plans |  |  |  |  |  |  |  |  | 80,143 | 38,728 |  |
Repurchased and canceled pursuant to the stock buy-back |  |  |  |  |  |  |  |  | (323,249) | (236,122) |  |
Class A Stock outstanding, end of year | 12,698,703 |  |  |  | 12,941,809 |  |  |  | 12,698,703 | 12,941,809 | 13,139,203 |
Dividends |  |  |  |  |  |  |  |  | $ 0.46 | $ 0.44 | $ 0.44 |
New Program [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 8.4 | $ 5.9 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Per Share |  |  |  |  |  |  |  |  | $ 25.99 | $ 24.96 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 589,535 |  |  |  | 272,784 |  |  |  | 589,535 | 272,784 |  | 666,192

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