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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Supplemental Financial Information [Abstract] |  |
Materials and supplies | $ 303.0 | $ 340.1
Prepaid expenses | 81.0 | 13.5
Prepaid taxes | 44.5 | 36.2
Deferred costs | 21.9 | 23.3
Assets held-for-sale | 20.9 | 2.3
Other | 29.5 | 31.1
Other current assets | $ 500.8 | $ 446.5

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