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Quarterly report pursuant to Section 13 or 15(d)

Capital (Details)

v3.19.1
Capital (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 15, 2019
USD ($)
$ / shares
Mar. 16, 2018
USD ($)
$ / shares
Mar. 31, 2019
$ / shares
shares
Mar. 31, 2018
$ / shares
shares
Class of Stock [Line Items] Ìý Ìý Ìý Ìý
Payments of dividends | $ $ 46.5 $ 31.7 Ìý Ìý
Dividend paid per sub-share (in dollars per share) Ìý Ìý $ 6 $ 4.05
Sub Shares Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý
Ratio of certificates to sub-shares Ìý Ìý 0.0003333333333 Ìý
Number of shares repurchased and retired (in shares) | shares Ìý Ìý 6,258 13,146
Cash Dividend | Sub Shares Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in dollars per share) $ 1.75 $ 1.05 Ìý Ìý
Special Dividend | Sub Shares Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý
Dividend paid per sub-share (in dollars per share) $ 4.25 $ 3 Ìý Ìý