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Restructuring and Acquisition-Related Costs Business Combinations, Separately Recognized Transactions Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Acquisition-Related Costs	$ 40.7
Severance Costs	7.2
Integration Expenses	45.4
Total Acquisition-Related Charges	93.3
Restructuring and acquisition-related costs	110.7	$ 26.2	$ 0.0
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost	$ 20.0

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- Definition

Business Combination, Acquisition & Integration Related Costs

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Costs incurred for restructuring initiatives as well as expenses directly related to acquisition activity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
-Section S99
-Paragraph 2
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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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