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Acquisitions (Summary of Acquisitions) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Cash paid, net of cash acquired	$ 75.0	$ 374.6
2019 Acquisitions
Business Acquisition [Line Items]
Cash paid, net of cash acquired	75.0
Debt issued	26.4
Total consideration	$ 101.4

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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