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Acquisitions PetMatrix Acquisition (details) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill (Note 12) | $ 2,276.4 |  | $ 2,277.1
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% |

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