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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Supplemental Financial Information [Abstract]
Materials and supplies	$ 360.7	$ 268.1
Prepaid taxes	58.3	35.0
Deferred costs	47.5	23.5
Prepaid expenses	16.2	15.2
Other	17.0	19.1
Other current assets	$ 499.7	$ 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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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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