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Acquisitions and Strategic Transaction Expenses Strategic Transaction and Integration Expenses - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Combinations [Abstract] |  |  |
Strategic Transaction Costs | $ 59.2 | $ 14.3 | $ 1.8

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