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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 30, 2021
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Supplemental Financial Information [Abstract] |  |  |
Prepaid taxes | $ 44.6 | $ 44.4 |
Deferred mobilization costs | 59.1 | 26.9 |
Prepaid expenses | 17.5 | 23.1 |
Other | 27.4 | 23.4 |
Other | $ 148.6 | $ 117.8 | $ 90.5

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