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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Supplemental Financial Information [Abstract]
Materials and supplies	$ 269.7	$ 279.4
Prepaid taxes	39.2	32.9
Prepaid expenses	28.8	43.4
Deferred costs	15.4	17.4
Other	30.4	24.8
Other current assets	$ 383.5	$ 397.9

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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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