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Annual report pursuant to Section 13 and 15(d)

Capital (Details)

v3.20.4
Capital (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2020
$ / shares
Mar. 31, 2020
$ / shares
Mar. 31, 2019
$ / shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Jan. 11, 2021
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Special dividends paid per sub-share certificate (in dollars per share) Ìý $ 16.00 Ìý $ 16.00 $ 4.25 $ 3.00 Ìý
Sub shares Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Ratio of certificates to sub-shares Ìý Ìý Ìý 0.0003 Ìý Ìý Ìý
Number of shares repurchased and retired (in shares) | shares Ìý Ìý Ìý 0 6,258 59,185 Ìý
Sub shares | Subsequent event Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Ratio of sub-shares to common stock Ìý Ìý Ìý Ìý Ìý Ìý 1
Cash dividend | Sub shares Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in USD per share) Ìý 10.00 $ 1.75 Ìý Ìý Ìý Ìý
Special dividend | Sub shares Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in USD per share) $ 10.00 $ 6.00 $ 4.25 Ìý Ìý Ìý Ìý