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Acquisitions (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |
Total cash consideration paid for acquisitions, net of cash acquired | $ 21.2 | $ 41.2
Payments of contingent consideration for acquisitions | 12.9 | $ 2.9
7S Group GmbH |  |
Business Acquisition [Line Items] |  |
Payments of contingent consideration for acquisitions | $ 10.3 |

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