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Fair Value Measurement - Reconciliation of Beginning and Ending Balances for Level 3 Contingent Liabilities (Parenthetical) (Details) - Level 3 - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Initial Public Offering | Restricted Stock Units
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Issuance of restricted stock units for settlement of contingent liabilities	89,842
Other Noncurrent Liabilities
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Deferred compensation liabilities	$ 1.7	$ 1.9

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Issuance of common stock for change of control contingent liabilities in shares.

+ References

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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