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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Supplemental Financial Information [Abstract] |  |
Materials and supplies | $ 308.9 | $ 340.1
Deferred costs | 32.6 | 23.3
Prepaid taxes | 45.5 | 36.2
Prepaid expenses | 11.4 | 13.5
Other | 29.1 | 33.4
Other current assets | $ 427.5 | $ 446.5

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