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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Supplemental Financial Information [Abstract]
Materials and supplies	$ 263.8	$ 268.1
Prepaid taxes	35.0	35.0
Deferred costs	28.2	23.5
Prepaid expenses	9.7	15.2
Other	18.1	19.1
Other current assets	$ 354.8	$ 360.9

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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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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