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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Supplemental Financial Information [Abstract] |  |
Materials and supplies | $ 347.1 | $ 268.1
Prepaid Taxes | 59.2 | 35.0
Other Deferred Costs, Net | 25.2 | 23.5
Prepaid expenses | 17.3 | 15.2
Assets held-for-sale | 8.9 | 0.0
Other | 29.8 | 19.1
Other current assets | $ 487.5 | $ 360.9

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