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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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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

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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=109223946&loc=d3e3291-108585

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