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Supplemental Financial Information (Cash Flows Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental Financial Information [Abstract]      
(Decrease) increase in liabilities $ (316.6) $ (379.2) $ 208.2
(Increase) decrease in accounts receivable 222.3 269.5 (38.5)
(Increase) decrease in other assets 86.1 25.7 (76.4)
Changes in operating assets and liabilities $ 8.2 $ 84.0 $ (93.3)