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Acquisitions Acquisitions Narrative (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Business Combinations [Abstract] |  |
Goodwill and intangible assets related to acquisitions | $ 14.2 | $ 22.9
Number of Businesses Acquired | 2 | 3

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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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Period Type: | instant

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- References No definition available. + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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