Basis of presentation and summary of significant accounting policies.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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- Definition

Amount of increase (decrease) in deferred revenue.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.A.4(a).Q1)
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-Name Accounting Standards Codification
-Topic 605
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-Section S99
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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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Amount of the effect of a change in accounting principle on net income.

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-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
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Summary of Significant Accounting Policies - Additional Information (Details) - ASU 2014-09 - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Impact to revenues due to adoption of new standard	$ 0.5	$ 0.7
Deferred revenue, revenue recognized		8.3
Deferred revenue due to performance obligations		$ 10.6
Retained Earnings
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cumulative effect adjustment to retained earnings			$ 0.1