Research and development expense during the period related to the costs of developing and achieving technological feasibility of a computer software product to be sold, leased, or otherwise marketed.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preliminary Project Stage
-URI http://asc.fasb.org/extlink&oid=6521637

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Research and Development
-URI http://asc.fasb.org/extlink&oid=6523717

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

Name:	us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Summary of Significant Accounting Policies and Basis of Presentation - Software Development Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Research and development costs from continuing operations, including the amortization of amounts previously capitalized	$ 2.2	$ 3.5	$ 3.0
Software Developed for Internal Use \| Minimum
Finite-Lived Intangible Assets [Line Items]
Expected useful life	3 years
Software Developed for Internal Use \| Maximum
Finite-Lived Intangible Assets [Line Items]
Expected useful life	7 years
Software Development
Finite-Lived Intangible Assets [Line Items]
Expected useful life	3 years