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Acquisitions (Details) € in Millions, $ in Millions |  | 9 Months Ended
--- | --- | ---
Sep. 03, 2015 USD ($) | Sep. 03, 2015 EUR (€) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  | $ 56.9 | $ 240.7
7S Group GmbH |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired | $ 140.4 | € 125.3 |  |

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