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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 |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Apr. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Equity [Abstract] |  |  |  |  |  |  |
Shares issued (in shares) | 16.9 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  | $ 0.01 | $ 0.01
Stock price (in dollars per share) | $ 91.00 |  |  |  |  |  |
Proceeds from sale of stock | $ 1,500.0 |  |  |  |  |  |
Dividend declared (in dollars per share) |  |  | $ 0.78 | $ 0.78 | $ 0.78 |  |
Common stock, dividends, per share, cash paid (in dollars per share) |  | $ 0.78 | $ 0.78 |  |  |  |

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