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Leases - Narratives (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) facility	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) facility	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Leases [Abstract]
Right of use assets	$ 31.2		$ 31.2
Operating lease liability	31.0		31.0
Operating lease liabilities, current	$ 5.3		$ 5.3		$ 6.3
Weighted average lease term	6 years		6 years
Operating lease weighted average discount rate (percent)	4.70%		4.70%
Operating lease rent expense	$ 2.5	$ 3.0	$ 8.4	$ 7.5
Number of operating contracts | facility	8		8

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Lessee, Operating Lease, Number Of Contracts

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- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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-Publisher FASB
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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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