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Shareholders' Equity - Schedule of Dividend Paid and Proposed (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 05, 2020 | Nov. 06, 2019 | Aug. 07, 2019 | May 01, 2019 | Feb. 06, 2019 | Nov. 07, 2018 | Aug. 01, 2018 | May 02, 2018 | Feb. 07, 2018 | Nov. 01, 2017 | Aug. 02, 2017 | May 03, 2017 | Feb. 01, 2017 | Nov. 02, 2016 | Aug. 03, 2016 | May 04, 2016 | Feb. 03, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  | $ 3.4 | $ 3.4 | $ 3.4 | $ 3.4 | $ 3.4 | $ 3.3 | $ 3.3 | $ 3.4 | $ 3.4 | $ 3.3 | $ 3.3 | $ 3.3 |  |  |  |  | $ 13.6 | $ 13.4 | $ 13.3
Common Stock, dividends, cash paid per share |  |  |  |  | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid | $ 3.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, dividends, cash paid per share | $ 0.125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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