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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Supplemental Financial Information [Abstract] |  |
Inventory | $ 340.1 | $ 268.1
Prepaid taxes | 36.2 | 35.0
Deferred mobilization costs | 23.3 | 23.5
Prepaid expenses | 13.5 | 15.2
Other | 33.4 | 19.1
Other current assets | $ 446.5 | $ 360.9

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