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Annual report pursuant to Section 13 and 15(d)

Capital (Details)

v3.10.0.1
Capital (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 16, 2018
USD ($)
$ / shares
Mar. 16, 2017
USD ($)
$ / shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý
Payments of dividends | $ $ 31.7 $ 10.7 Ìý Ìý Ìý
Sub Shares Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý
Ratio of certificates to sub-shares Ìý Ìý 0.0003333 Ìý Ìý
Number of shares repurchased and retired (in shares) | shares Ìý Ìý 59,185 105,715 190,750
Cash Dividend | Sub Shares Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in dollars per share) $ 1.05 $ 0.35 Ìý Ìý Ìý
Special Dividend | Sub Shares Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in dollars per share) $ 3 $ 1 Ìý Ìý Ìý