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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Supplemental Financial Information [Abstract]
Inventory	$ 278.8	$ 225.2
Deferred mobilization costs	29.7	32.4
Prepaid taxes	43.5	30.7
Prepaid expenses	14.2	7.9
Other	15.0	19.8
Other current assets	$ 381.2	$ 316.0

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Supplemental Financial Information [Abstract]

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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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