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Summary of Significant Accounting Policies - (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Oct. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Revenue recognition, new accounting pronouncement, timing | less than one year |  |  |  |  |  |
Previously Reported |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Increase (decrease) in restricted cash |  | $ (0.3) |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of change in accounting for employee share-based payments |  |  | $ 0.0 |  | $ (7.1) | $ 0.0 | $ 0.0
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of change in accounting for employee share-based payments |  |  |  | $ (7.1) |  |  |

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