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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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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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