Assets - Other Assets (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Kateeva
Other Investment Not Readily Marketable [Line Items]
Carrying amount	$ 21.0	$ 21.0
Kateeva \| Maximum
Other Investment Not Readily Marketable [Line Items]
Percentage ownership of cost method investee	20.00%
Separate non-marketable investment
Other Investment Not Readily Marketable [Line Items]
Amount of investment made	$ 3.5
Separate non-marketable investment \| Maximum
Other Investment Not Readily Marketable [Line Items]
Percentage ownership of cost method investee	20.00%

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No definition available.

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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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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.

+ References

No definition available.

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