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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Supplemental Financial Information [Abstract] |  |
Inventory | $ 279.4 | $ 340.1
Prepaid taxes | 32.9 | 36.2
Deferred mobilization costs | 17.4 | 23.3
Prepaid expenses | 43.4 | 13.5
Other | 24.8 | 33.4
Other current assets | $ 397.9 | $ 446.5

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