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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Supplemental Financial Information [Abstract]
Inventory	$ 225.2	$ 235.3
Deferred mobilization costs	32.4	52.1
Prepaid taxes	30.7	73.5
Prepaid expenses	7.9	20.5
Other	19.8	20.4
Other current assets	$ 316.0	$ 401.8

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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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