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Shareholders' Equity - Schedule of Dividend Paid and Proposed (Details) - USD ($) $ / shares in Units, $ in Millions														12 Months Ended
	Feb. 04, 2021	Nov. 04, 2020	Aug. 05, 2020	May 06, 2020	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	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Dividends paid		$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.4	$ 3.3	$ 3.3	$ 3.4	$ 13.6	$ 13.6	$ 13.4
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
Subsequent Event
Class of Stock [Line Items]
Dividends paid	$ 3.4
Common Stock, dividends, cash paid per share	$ 0.125

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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=120397183&loc=d3e187085-122770

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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