Income Taxes Net Operating Loss Carry Forward (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards		$ 232.7
Deferred Tax Liabilities, Net, Noncurrent	$ 0.0	$ 1.1

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31958-109318

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant