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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Apr. 30, 2021	Dec. 31, 2020
Supplemental Financial Information [Abstract]
Prepaid taxes	$ 44.4		$ 32.9
Prepaid expenses	29.1		43.4
Elimination of other deferred costs	20.2		17.4
Materials and supplies	0.0		279.4
Other	26.0		13.4
Other current assets	$ 119.7	$ 90.5	$ 386.5

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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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