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Acquisitions (Details) € in Millions			6 Months Ended
	Apr. 26, 2017 USD ($)	Apr. 26, 2017 EUR (€)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Total cash consideration for acquisitions, net of cash acquired			$ 47,400,000	$ 34,100,000
Initial acquisition payments			8,200,000	21,200,000
Payments of contingent consideration for acquisitions			39,200,000
Payment for contingent consideration liability, financing activities			15,100,000	12,900,000
Payment for contingent consideration liability, operating activities			24,100,000
7S Group GmbH
Business Acquisition [Line Items]
Payment for contingent consideration liability, financing activities				$ 10,300,000
7S Group GmbH
Business Acquisition [Line Items]
Loss contingency, additional consideration sought from the seller of 7S	$ 24,300,000	€ 20.8
Loss Contingency, Estimate of Possible Loss			$ 0

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The cash outflow from operating and financing activities for the payments of contingent consideration associated with the acquisitions of businesses.

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Total cash consideration for acquisitions, net of cash acquired

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability exceeding amount recognized at acquisition date. Includes, but is not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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