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Business Combinations - VCT Vogel GmbH (Details) € in Millions, $ in Millions |  | 9 Months Ended
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Aug. 31, 2017 USD ($) | Aug. 31, 2017 EUR (€) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Business Acquisition |  |  |  |
Payment for acquisition of businesses, net of cash acquired |  |  | $ 12.5 | $ 446.0
VCT Vogel GmbH |  |  |  |
Business Acquisition |  |  |  |
Voting percentage acquired | 100.00% | 100.00% |  |
Payment for acquisition of businesses, net of cash acquired | $ 4.2 | € 3.6 |  |

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