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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
UNITED STATES
Concentration Risk [Line Items]
Concentration Risk, Percentage	90.00%	89.60%	89.50%	88.70%
Topic 606
Concentration Risk [Line Items]
Accounts receivable	$ 16.3		$ 16.3		$ 19.5

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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