Income Taxes - Schedule of Pre-tax Income (Loss) from Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2021
Pre-tax income (loss) from continuing operations
Domestic	$ 16.8	$ 705.9	$ 243.1	$ 489.0
Foreign	7.4	91.7	32.5	56.3
Income before income taxes and earnings (losses) of unconsolidated affiliates	$ 24.2	$ 797.6	$ 275.6	$ 545.3

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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