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Supplemental Financial Information (Cash Flows Information) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Supplemental Financial Information [Abstract] |  |  |
(Increase) decrease in accounts receivable | $ 29.5 | $ (6.2) | $ 83.2
(Increase) decrease in other assets | (32.0) | (2.8) | (14.0)
(Decrease) increase in liabilities | (25.4) | 2.7 | 3.2
Changes in operating assets and liabilities | $ (27.9) | $ (6.3) | $ 72.4

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