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Summary of Significant Accounting Policies - Equity-Based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Income tax benefits related to excess tax benefits for share-based awards | $ 10.3 |
Decrease to deferred income tax liabilities | $ (1,357.0) | $ (1,212.4)
Retained earnings |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Increase to retained earnings |  | 4.9
ASU 2016-09 | New Accounting Pronouncement, Early Adoption, Effect |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Decrease to deferred income tax liabilities |  | 4.9
ASU 2016-09 | New Accounting Pronouncement, Early Adoption, Effect | Retained earnings |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Increase to retained earnings |  | $ 4.9

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