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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Supplemental Financial Information [Abstract]
Materials and supplies	$ 293.1	$ 340.1
Prepaid expenses	64.3	13.5
Prepaid taxes	49.9	36.2
Deferred costs	21.5	23.3
Other	25.9	33.4
Other current assets	$ 454.7	$ 446.5

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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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