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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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