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Revenue Recognition - Contract Balances, Information About Receivables and Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Trade receivables, billed	$ 27.5	$ 27.5	$ 40.3
Unbilled accounts receivable, current	6.9	6.9	9.5
Unbilled accounts receivable, long term	10.6	10.6	10.6
Deferred revenue (contract liabilities)	22.6	22.6	$ 31.7
Revenue recognized that was included in deferred revenue	$ 8.6	$ 27.9

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

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+ References

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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