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Shareholders' Equity - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions | Oct. 14, 2019 | Jul. 09, 2019 | Apr. 03, 2019 | Feb. 04, 2019 | Oct. 15, 2018 | Jul. 10, 2018 | Apr. 11, 2018 | Feb. 05, 2018 | Oct. 12, 2017 | Jul. 10, 2017 | Apr. 25, 2017 | Feb. 06, 2017
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Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0.48 |  |  |  |  |  |  |  |  |  |  |
Aggregate Payment Amount | $ 58.2 |  |  |  |  |  |  |  |  |  |  |
Dividend Paid |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) |  | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.47 | $ 0.47
Aggregate Payment Amount |  | $ 58.2 | $ 58.2 | $ 57.9 | $ 57.2 | $ 57.2 | $ 57.4 | $ 58.3 | $ 58.3 | $ 58.3 | $ 58.4 | $ 52.5
Dividend Paid | Qualified |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0.0461171 | $ 0.0461171 | $ 0.0461171 | $ 0.0461171 | $ 0.0176751 | $ 0.0176751 | $ 0.0176751 | $ 0.0175622
Dividend Paid | Non-Qualified |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | 0.2759699 | 0.2759699 | 0.2759699 | 0.2759699 | 0.2090220 | 0.2090220 | 0.2090220 | 0.2090220 | 0.2484259 | 0.2484259 | 0.2484259 | 0.2468402
Dividend Paid | Nondividend Distributions |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Per Share (in dollars per share) | $ 0.2040301 | $ 0.2040301 | $ 0.2040301 | $ 0.2040301 | $ 0.2148609 | $ 0.2148609 | $ 0.2148609 | $ 0.2148609 | $ 0.2038990 | $ 0.2038990 | $ 0.2038990 | $ 0.2025975

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