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Assets - Other Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Other assets
Carrying value	$ 21.0	$ 21.0
Additional investment	$ 3.5
Maximum
Other assets
Percentage ownership of cost method investee	20.00%

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Aggregate carrying value of owned private equity or other securities for which a quoted market price is not readily determinable, the value of which has been determined by management based upon fair value methods, including pricing of similar securities and valuation techniques and is included in the schedule of financial condition or the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

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- Definition

The percentage of ownership in the investee accounted for under the cost method of accounting.

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Equity Securities, Fair Value Recognized in Net Income and without Readily Determinable Fair Value, Total.

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