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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 30, 2021
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Supplemental Financial Information [Abstract] |  |  |
Deferred mobilization costs | $ 75.3 | $ 59.1 |
Prepaid taxes | 49.1 | 44.6 |
Prepaid expenses | 23.6 | 17.5 |
Other | 29.2 | 27.4 |
Other | $ 177.2 | $ 148.6 | $ 90.5

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