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Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions	Mar. 31, 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	56	56
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 434.6	$ 436.2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Summary of Earn-out Payments [Line Items]
Earn-out Liabilities, Short-Term	45.5	49.6
Earn-out Liabilities, Long-Term	$ 174.8	$ 177.5

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- Definition

Earn-out Liabilities, Long-Term

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- Definition

Earn-out Liabilities, Short-Term

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- Definition

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

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[Line Items] for Summary of Earn-out Payments [Table]

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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