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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill by Segment | Changes in the carrying amount of goodwill by segment for the years ended December 31, 2017 and 2016 were as follows:
|  | Total |  |  | Services |  |  | Technology |
Balance at December 31, 2015 |  | $ | 177.4 |  |  | $ | 68.7 |  |  | $ | 108.7 |
Translation adjustments |  | 1.2 |  |  | 1.2 |  |  | — |
Balance at December 31, 2016 |  | 178.6 |  |  | 69.9 |  |  | 108.7 |
Translation adjustments |  | 2.2 |  |  | 2.2 |  |  | — |
Balance at December 31, 2017 |  | $ | 180.8 |  |  | $ | 72.1 |  |  | $ | 108.7 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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