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Acquisition and Strategic Transaction Transaction Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Combinations [Abstract] |  |  |  |
Strategic transaction expenses | $ 23.5 | $ 15.5 | $ 61.3 | $ 49.0

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- Definition Strategic transaction expenses + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration