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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
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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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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