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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Supplemental Financial Information [Abstract]
Prepaid taxes	$ 42.8	$ 44.4
Prepaid expenses	21.4	23.1
Elimination of other deferred costs	31.8	26.9
Other	29.7	23.4
Other current assets	$ 125.7	$ 117.8

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Amount of current assets classified as other.

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