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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
United States
Concentration Risk [Line Items]
Concentration risk, percentage	88.80%	87.50%
ASC 606
Concentration Risk [Line Items]
Accounts receivable	$ 27.1		$ 19.5

X

- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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