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Business Combinations (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) acquisition | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) acquisition | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of Businesses Acquired | acquisition | 4 |  |  |
Payments to Acquire Businesses | $ 20.3 |  |  |
Cash Acquired in Excess of Payments to Acquire Business | (5.6) |  |  |
Business Combinations, Guaranteed Deferred Acquisition Obligation | 1.8 | $ 23.5 |  |
Business Combination, contingent earn-out consideration | 9.6 |  |  |
Goodwill, Acquired During Period | 23.0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 9.5 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 0.8 |  |  |
Payment for deferred acquisition obligations and earn-out obligation | (10.1) | (2.1) |  |
Goodwill, Period Increase (Decrease) | 3.0 |  |  |
Deferred acquisition obligations paid | 1.9 |  |  |
Maximum amount of the potential earn-out payments | $ 442.4 |  | $ 435.0 |
Number of acquisitions subject to potential earn-out payments provisions | acquisition | 56 |  | 52 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 232.8 | $ 158.8 | $ 229.6 | $ 127.3

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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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