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Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions | Jun. 30, 2018 USD ($) acquisition | Dec. 31, 2017 USD ($) acquisition
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Summary of Earn-out Payments [Line Items] |  |
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition | 54 | 56
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 393.7 | $ 436.2
Business Combination, Contingent Consideration, Liability, Current | 70.9 | 80.1
Business Combination, Contingent Consideration, Liability, Noncurrent | 182.0 | 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 | 41.9 | 49.6
Business Combination, Contingent Consideration, Liability, Noncurrent | $ 137.7 | $ 177.5

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