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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 | Apr. 30, 2020 | Oct. 30, 2019 | Sep. 30, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Jul. 09, 2020
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared (in dollars per share) |  |  |  | $ 0.78 |  |  | $ 0.78 | $ 0.78 | $ 0.78 | $ 0.70 | $ 0.70 | $ 0.70 | $ 0.78 | $ 2.18 |
Common stock, dividends, per share, cash paid (in dollars per share) |  | $ 0.78 | $ 0.78 |  | $ 0.70 | $ 0.70 | $ 0.78 |  |  |  | $ 0.70 |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  | $ 0.01 |  | $ 0.01
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) | 9.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of stock | $ 557.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 60.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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