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Dividends Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 29, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dividends payable |  |  |  | $ 655.1 | $ 395.4 | $ 519.2
Payments of Ordinary Dividends, Common Stock |  | $ 395.4 | $ 519.0 |  |  |
Annual variable dividend |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  | $ 0.6808 | $ 0.8882 |  |  |
Subsequent Event | Annual variable dividend |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 1.1247 |  |  |  |  |

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