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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Supplemental Financial Information [Abstract]
Materials and supplies	$ 347.1	$ 268.1
Prepaid Taxes	59.2	35.0
Other Deferred Costs, Net	25.2	23.5
Prepaid expenses	17.3	15.2
Assets held-for-sale	8.9	0.0
Other	29.8	19.1
Other current assets	$ 487.5	$ 360.9

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- Definition

Amount of assets held-for-sale that are not part of a disposal group.

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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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