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Quarterly report pursuant to Section 13 or 15(d)

Capital (Details)

v3.10.0.1
Capital (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 16, 2018
Mar. 16, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Payments of dividends $ 31.7 $ 10.7 Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in usd per share) Ìý Ìý $ 0 $ 0 $ 4.05 $ 1.35
Certificate Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Number of shares used in ratio (in shares) Ìý Ìý Ìý Ìý 1 Ìý
Sub Shares Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Number of shares used in ratio (in shares) Ìý Ìý Ìý Ìý 3,000 Ìý
Number of shares repurchased and retired (in shares) Ìý Ìý Ìý Ìý 29,062 68,760
Cash Dividend | Sub Shares Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in usd per share) $ 1.05 $ 0.35 Ìý Ìý Ìý Ìý
Special Dividend | Sub Shares Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in usd per share) $ 3 $ 1.00 Ìý Ìý Ìý Ìý