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Shareholders' Equity - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions | Oct. 06, 2020 | Jul. 07, 2020 | Apr. 06, 2020 | Feb. 03, 2020 | Oct. 14, 2019 | Jul. 09, 2019 | Apr. 03, 2019 | Feb. 04, 2019 | Oct. 15, 2018 | Jul. 10, 2018 | Apr. 11, 2018 | Feb. 05, 2018
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Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Oct. 06, 2020 | Jul. 07, 2020 | Apr. 06, 2020 | Feb. 03, 2020 | Oct. 14, 2019 | Jul. 09, 2019 | Apr. 03, 2019 | Feb. 04, 2019 | Oct. 15, 2018 | Jul. 10, 2018 | Apr. 11, 2018 | Feb. 05, 2018
Dividends payable, date to be paid | Oct. 23, 2020 | Jul. 24, 2020 | Apr. 24, 2020 | Feb. 21, 2020 | Nov. 01, 2019 | Jul. 26, 2019 | Apr. 22, 2019 | Feb. 22, 2019 | Nov. 02, 2018 | Jul. 27, 2018 | May 03, 2018 | Feb. 27, 2018
Dividends payable, date of record | Oct. 16, 2020 | Jul. 17, 2020 | Apr. 17, 2020 | Feb. 14, 2020 | Oct. 25, 2019 | Jul. 19, 2019 | Apr. 15, 2019 | Feb. 15, 2019 | Oct. 26, 2018 | Jul. 20, 2018 | Apr. 23, 2018 | Feb. 16, 2018
Dividend Paid |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0.34 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.47
Aggregate Payment Amount | $ 41.5 | $ 58.5 | $ 58.5 | $ 58.2 | $ 58.2 | $ 58.2 | $ 58.2 | $ 57.9 | $ 57.2 | $ 57.2 | $ 57.4 | $ 58.3
Dividend Paid | Qualified Shareholder |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.046117 | $ 0.046117 | $ 0.046117 | $ 0.046117
Dividend Paid | Non Qualified Shareholder |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0.1881193 | $ 0.2655802 | $ 0.2655802 | $ 0.2655802 | $ 0.2759699 | $ 0.2759699 | $ 0.2759699 | $ 0.2759699 | 0.209022 | 0.209022 | 0.209022 | 0.209022
Dividend Paid | Return Of Capital |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0.1518807 | $ 0.2144198 | $ 0.2144198 | $ 0.2144198 | $ 0.2040301 | $ 0.2040301 | $ 0.2040301 | $ 0.2040301 | $ 0.2148609 | $ 0.2148609 | $ 0.2148609 | $ 0.2148609

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