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Supplemental Financial Information (Cash Flows Information) (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Supplemental Financial Information [Abstract] |  |  |  |
(Increase) decrease in accounts receivable | $ 23.2 | $ (18.3) | $ 53.3 | $ 29.5
(Increase) decrease in other assets | 27.3 | (48.4) | (63.8) | (56.6)
(Decrease) increase in liabilities | 18.0 | 77.0 | (11.5) | (25.4)
Changes in operating assets and liabilities | $ 68.5 | $ 10.3 | $ (22.0) | $ (52.5)

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