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Supplemental Financial Information (Cash Flows Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Financial Information [Abstract]      
(Increase) decrease in accounts receivable $ (6.2) $ 83.2 $ 222.4
(Increase) decrease in other assets (2.8) (14.0) 44.0
(Decrease) increase in liabilities (9.0) (3.8) (125.8)
Changes in operating assets and liabilities $ (18.0) $ 65.4 $ 140.6