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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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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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