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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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