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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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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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Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies.

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