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Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2017
Business Combinations [Abstract] |
Summary of aggregate disclosure related to business acquisitions | The following table summarizes an aggregate disclosure related to business acquisitions completed in 2017:
| Total Consideration | Cash paid, net of cash acquired | Contingent Consideration (1) | Allocation of purchase price to Intangible assets, net (2) | Weighted average useful life of acquired intangible assets | Excess purchase price allocated to Goodwill
Aggregate total | $ | 66.0 |  | $ | 57.7 |  | $ | 7.5 |  | $ | 56.4 |  | 8.3 Years | $ | 14.6 |
1 Contingent consideration as determined by fair value and included in the consideration transferred, with no material changes subsequent to the initial measurement. 2 Intangible assets primarily consist of technology-based and customer relationship intangible assets. The fair value of these intangible assets was determined using a combination of a relief from royalty method and the excess earnings method using Level 3 in the hierarchy as established by ASC 820. The discount rates and royalty rates used in the valuation analysis ranged between 9% and 20% and 1% and 16%, respectively.

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- Definition Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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