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Summary of Significant Accounting Policies - Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items] |  |  |
Discount rates | 25.00% |  |
Customer attrition rates | 20.00% |  |
Intangible asset impairment charges |  | $ 1.1 |
Minimum |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Discount rates |  |  | 17.00%
Customer attrition rates |  |  | 15.00%
Maximum |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Discount rates |  |  | 25.00%
Customer attrition rates |  |  | 78.00%

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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