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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Supplemental Financial Information [Abstract]
Inventory	$ 268.1	$ 278.8
Prepaid taxes	35.0	43.5
Deferred mobilization costs	23.5	29.7
Prepaid expenses	15.2	14.2
Other	19.1	15.0
Other current assets	$ 360.9	$ 381.2

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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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