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Accounting Changes Accounting Changes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 01, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings, tax effect |  |  |  | $ (6.6) |
Accounting Standards Update 2018-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings, tax effect | $ 6.6 |  |  |  |
Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net periodic defined benefits expense (reversal of expense), excluding service cost component |  | $ 0.2 | $ (1.5) | $ 0.3 | $ (4.7)

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