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Restructuring and Acquisition-Related Costs - Business Combinations, Separately Recognized Transactions Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Acquisition-Related Costs	$ 0.0	$ 1.8	$ 1.2
Severance Costs	0.0	0.0	0.5
Integration Expenses	8.8	16.2	33.0
Total acquisition-related charges	8.8	18.0	34.7
Restructuring and acquisition-related costs	$ 67.2	$ 57.8	$ 78.9

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

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Total acquisition-related charges

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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.

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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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