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Leases - Lease Cost and Other Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases - Lease Cost and Other Information [Abstract]
Total operating lease costs	$ 2.8	[1]
Other Information
Operating cash flows from operating leases	$ 2.0
Weighted-average remaining lease term – operating leases	4 years 2 months 12 days
Weighted-average discount rate – operating leases	4.00%
[1] Includes short-term leases, which are immaterial.

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- Definition

Leases - Lease Cost and Other Information [Abstract]

+ References

No definition available.

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- Definition

Other information on leases.

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No definition available.

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- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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-Topic 842
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-Section 55
-Paragraph 53
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
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Weighted average discount rate for operating lease calculated at point in time.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

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