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Financial Instruments and Risk Management - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Sep. 30, 2018
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Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation | $ (27.4) | $ (29.0)
Exit lease liability | (0.3) | (0.6)
Net Liabilities at estimated fair value | (32.0) | (17.7)
Foreign currency contracts | Not Designated as Hedging Instrument |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - Foreign Currency contracts | (1.0) | (0.1)
Foreign currency contracts | Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - Foreign Currency contracts | 1.3 | 4.3
Foreign currency contracts | Level 2 | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - Foreign Currency contracts | (1.0) | (0.1)
Derivatives - 2017 and 2018 Interest Rate swaps | Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - Foreign Currency contracts | (3.9) | 7.7
Commodity contract | Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives - Foreign Currency contracts | (0.7) | 0.0
Estimate of Fair Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt, Percentage Bearing Fixed Interest, Fair Value Amount | $ 2,493.4 | $ 599.2

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