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Business Combinations (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) acquisition | Jun. 30, 2015 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) acquisition
Business Acquisition [Line Items] |  |  |  |
Number of Businesses Acquired | acquisition | 16 |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 93.0 | $ 41.7 |  |
Business Combinations, Guaranteed Deferred Acquisition Obligation | 29.4 | 5.1 |  |
Business Combination, contingent earn-out consideration | 47.2 | $ 13.4 |  |
Goodwill, Acquired During Period | 143.8 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 20.3 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 5.5 |  |  |
Deferred acquisition obligations paid | 30.6 |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest | 2.8 |  |  |
Goodwill, Period Increase (Decrease) | 8.7 |  |  |
Business Combination, identifiable intangible increase (decrease) | (4.5) |  |  |
Business combination, other net assets acquired increase(decrease) | (4.2) |  |  |
Maximum amount of the potential earn-out payments | $ 301.4 |  |  | $ 230.4
Number of acquisitions subject to potential earn-out payments provisions | acquisition | 43 |  |  | 28
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 169.6 |  | $ 158.8 | $ 127.3

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 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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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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