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Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions	Jun. 30, 2020 USD ($) acquisition	Dec. 31, 2019 USD ($) acquisition
Summary of Earn-out Payments [Line Items]
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition	44	44
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 221.1	$ 268.9
Business Combination, Contingent Consideration, Liability, Current	97.8	74.4
Business Combination, Contingent Consideration, Liability, Noncurrent	44.7	124.1
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Summary of Earn-out Payments [Line Items]
Business Combination, Contingent Consideration, Liability, Current	78.2	53.9
Business Combination, Contingent Consideration, Liability, Noncurrent	$ 19.6	$ 94.5

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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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