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Common Stock and Related Matters (Tables) | 12 Months Ended
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Dec. 31, 2020
Class Of Stock Disclosures [Abstract] |
Dividends Declared and/or Paid | The following table details the dividends declared and/or paid by us to common shareholders for the years ended December 31, 2020, 2019 and 2018:
Three Months Ended |  | Date Paid or To Be Paid |  | Total Common Dividends Declared |  |  | Amount of Common Dividends Paid or To Be Paid |  |  | Accrued Dividends (1) |  |  | Dividends Declared per Share of Common Stock |
(In millions, except per share amounts) |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2020 |  | February 16, 2021 | $ |  | 23.3 |  | $ |  | 22.9 |  | $ |  | 0.4 |  | $ |  | 0.10000 |
September 30, 2020 |  | November 16, 2020 |  |  | 23.8 |  |  |  | 23.3 |  |  |  | 0.5 |  |  |  | 0.10000 |
June 30, 2020 |  | August 17, 2020 |  |  | 23.7 |  |  |  | 23.3 |  |  |  | 0.4 |  |  |  | 0.10000 |
March 31, 2020 |  | May 15, 2020 |  |  | 23.7 |  |  |  | 23.3 |  |  |  | 0.4 |  |  |  | 0.10000 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2019 |  | February 18, 2020 | $ |  | 216.0 |  | $ |  | 212.0 |  | $ |  | 4.0 |  | $ |  | 0.91000 |
September 30, 2019 |  | November 15, 2019 |  |  | 215.5 |  |  |  | 211.8 |  |  |  | 3.7 |  |  |  | 0.91000 |
June 30, 2019 |  | August 15, 2019 |  |  | 215.1 |  |  |  | 211.5 |  |  |  | 3.6 |  |  |  | 0.91000 |
March 31, 2019 |  | May 15, 2019 |  |  | 215.2 |  |  |  | 211.5 |  |  |  | 3.7 |  |  |  | 0.91000 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  | February 15, 2019 | $ |  | 215.2 |  | $ |  | 211.2 |  | $ |  | 4.0 |  | $ |  | 0.91000 |
September 30, 2018 |  | November 15, 2018 |  |  | 212.5 |  |  |  | 208.6 |  |  |  | 3.9 |  |  |  | 0.91000 |
June 30, 2018 |  | August 15, 2018 |  |  | 208.9 |  |  |  | 205.2 |  |  |  | 3.7 |  |  |  | 0.91000 |
March 31, 2018 |  | May 16, 2018 |  |  | 203.1 |  |  |  | 199.7 |  |  |  | 3.4 |  |  |  | 0.91000 |
(1) | Represents accrued dividends on restricted stock and restricted stock units that are payable upon vesting.

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