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v3.20.2

Information by Operating Segment - Reconciliation of Consolidated Net Economic Earnings to Consolidated Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ (19.7) | $ (92.3) | $ 133.6 | $ 67.0 | $ (34.3) | $ (3.0) | $ 154.6 | $ 67.3 | $ 88.6 | $ 184.6 | $ 214.2
Impairments |  |  |  |  |  |  |  |  | 148.6 | 0.0 | 0.0
Provision for ISRS rulings |  |  |  |  |  |  |  |  | 0.0 | 12.2 | 0.0
Missouri regulatory adjustments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 30.6
Fair value and timing adjustments |  |  |  |  |  |  |  |  | 2.5 | 1.2 | (4.3)
Acquisition, divestiture and restructuring activities |  |  |  |  |  |  |  |  | 0.0 | 0.4 | 13.6
Income tax effect of adjustments |  |  |  |  |  |  |  |  | (31.9) | (3.3) | (10.3)
Effect of the Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (60.1)
Net Economic Earnings |  |  |  |  |  |  |  |  | $ 207.8 | $ 195.1 | $ 183.7

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