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Derivative Instruments and Hedging Activities - Derivative Instruments Reconciliation (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
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Offsetting Derivative Assets [Abstract] |  |
Fair value of derivative assets presented above | $ 49.2 | $ 24.2
Fair value of cash margin receivable offset with derivatives | (9.0) | 14.3
Netting of assets and liabilities with the same counterparty | (23.0) | (23.7)
Derivative asset after the effects of netting | 17.2 | 14.8
Current Assets – Other | 15.8 | 4.2
Deferred Charges and Other Assets – Other | 1.4 | 10.6
Offsetting Derivative Liabilities [Abstract] |  |
Fair value of derivative liabilities presented above | 99.5 | 78.5
Netting of assets and liabilities with the same counterparty | (23.0) | (23.7)
Derivative liability after the effects of netting | 76.5 | 54.8
Current Liabilities – Other | 71.0 | 50.0
Deferred Credits and Other Liabilities – Other | $ 5.5 | $ 4.8

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