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Business Combinations (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($) acquisition | Jun. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |
Number of Businesses Acquired | acquisition | 3 |
Payments to Acquire Businesses | $ 11.2 |
Business Combinations, Guaranteed Deferred Acquisition Obligation | 0.0 | $ 1.8
Business Combination, contingent earn-out consideration | 1.7 |
Goodwill, Acquired During Period | 10.7 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 2.1 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 0.1 |
Payment for deferred acquisition obligations and earn-out obligation | 40.8 |
Payments for Repurchase of Redeemable Noncontrolling Interest | $ 1.5 |

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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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