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Dividends (Tables) | 12 Months Ended
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Dec. 31, 2017
Dividends [Abstract] |
Dividends | Following is a summary of our shareholder dividends that were declared in the last three years:
(millions, except per share amounts) |  | Amount
Dividend Type | Declared | Paid | Per Share |  | Total 1 |
Annual – Variable | December 2017 | February 2018 | $ | 1.1247 |  | $ | 655.1 |
Annual – Variable | December 2016 | February 2017 | 0.6808 |  | 395.4 |
Annual – Variable | December 2015 | February 2016 | 0.8882 |  | 519.2 |
1 Based on an estimate of shares outstanding as of the record date. For the dividends declared in December 2016 and 2015, we paid $395.4 million and $519.0 million, respectively.

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