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Supplemental Financial Information (Cash Paid For Interest And Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Financial Information [Abstract]      
Interest, net of amounts capitalized $ 199.8 $ 264.8 $ 249.3
Income taxes $ 62.8 $ 56.4 $ 97.3