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Supplemental Financial Information (Cash Flows Information) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Financial Information [Abstract] |  |  |
(Increase) decrease in accounts receivable | $ 53.3 | $ 29.5 | $ (6.2)
(Increase) decrease in other assets | (63.8) | (56.6) | (17.3)
(Decrease) increase in liabilities | (11.5) | (25.4) | 2.7
Changes in operating assets and liabilities | $ (22.0) | $ (52.5) | $ (20.8)

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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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