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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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of asset related to consideration paid in advance for other costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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