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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Supplemental Financial Information [Abstract]
Materials and supplies	$ 303.0	$ 340.1
Prepaid expenses	81.0	13.5
Prepaid taxes	44.5	36.2
Deferred costs	21.9	23.3
Assets held-for-sale	20.9	2.3
Other	29.5	31.1
Other current assets	$ 500.8	$ 446.5

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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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