| **Income Taxes Schedule of Income before Income Tax (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|-----------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Income Tax Disclosure [Abstract]**                                                    |           |            |   |   |   |   |   |   |   |   |   |
| United States income before tax                                                         |           |            |   |   |   |   |   |   | $ 2,440.0 | $ 251.0 | $ 730.0 |
| International income before income taxes                                                |           |            |   |   |   |   |   |   | 32.0 | 0.0 | 0.0 |
| Income before income taxes                                                              | $ 781.0        | $ 294.0         | $ 530.0 | $ 867.0 | $ (581.0) | $ 618.0 | $ 264.0 | $ (50.0) | $ 2,472.0 | $ 251.0 | $ 730.0 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| X                                                                                                                                                                                                     |
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| - References
No definition available.
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