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Summary of Significant Accounting Policies Effects of Early Adoption of New Accounting Pronouncement (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Oct. 01, 2017
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New Accounting Pronouncement, Early Adoption [Line Items] |  |
Long-term deferred income tax assets | $ 134.7 | $ 795.4
Long-term deferred income tax liabilities (included in Other long-term liabilities) | $ 270.2 | 6.3
Net deferred tax asset |  | $ 789.1

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