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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Apr. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Supplemental Financial Information [Abstract] |  |  |
Inventory | $ 0.0 |  | $ 279.4
Prepaid expenses | 23.1 |  | 43.4
Prepaid taxes | 44.4 |  | 32.9
Deferred mobilization costs | 26.9 |  | 17.4
Other | 23.4 |  | 13.4
Other | $ 117.8 | $ 90.5 | $ 386.5

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