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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements
Increase in valuation allowance	$ (8.4)	$ 14.7	$ 13.6
Accounting Standards Update 2016-09
New Accounting Pronouncements
Deferred tax assets related to federal and state net operating losses	0.2
Increase in valuation allowance	$ 0.2

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- Definition

Amount of deferred state, local, and federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318

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