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Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions	Sep. 30, 2018 USD ($) acquisition	Dec. 31, 2017 USD ($) acquisition
Summary of Earn-out Payments [Line Items]
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition	55	56
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 382.9	$ 436.2
Business Combination, Contingent Consideration, Liability, Current	60.0	80.1
Business Combination, Contingent Consideration, Liability, Noncurrent	168.1	228.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Summary of Earn-out Payments [Line Items]
Business Combination, Contingent Consideration, Liability, Current	32.6	49.6
Business Combination, Contingent Consideration, Liability, Noncurrent	$ 130.7	$ 177.5

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The number of acquisitions subject to potential earn-out payment provisions.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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