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Segments - Schedule of Acquisition and Integration Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration costs | $ 28.0 | $ 15.9 | $ 159.9 | $ 41.0
Cost of products sold |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration costs | 12.4 | 0.0 | 44.1 | 0.0
Selling, general and administrative expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration costs | 15.1 | 22.4 | 63.1 | 44.6
Research and development expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration costs | 0.3 | 0.0 | 0.3 | 0.0
Interest expense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration costs | 0.0 | 3.4 | 65.6 | 6.3
Other items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration costs | $ 0.2 | $ (9.9) | $ (13.2) | $ (9.9)

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