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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 |
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 15, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 1.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.11 | $ 0.11 | $ 1.48 | $ 0.46 |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Class A Stock outstanding, beginning of year |  |  |  | 12,698,703 |  |  |  | 12,941,809 | 12,698,703 | 12,941,809 |  |
Issued pursuant to shared-based compensation plans |  |  |  |  |  |  |  |  | 401,597 | 80,143 |  |
Repurchased and canceled pursuant to the stock buy-back |  |  |  |  |  |  |  |  | (718,522) | (323,249) |  |
Class A Stock outstanding, end of year | 12,381,778 |  |  |  | 12,698,703 |  |  |  | 12,381,778 | 12,698,703 | 12,941,809 |
Dividends |  |  |  |  |  |  |  |  | $ 1.48 | $ 0.46 | $ 0.44 |
New Program [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 15.0 | $ 8.4 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Per Share |  |  |  |  |  |  |  |  | $ 20.94 | $ 25.99 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 401,013 |  |  |  | 589,535 |  |  |  | 401,013 | 589,535 |  | 628,625

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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