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Other Financial Information (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Cash income taxes paid (collected), net of refunds $ 12.0 $ 29.3
Interest paid, net of amounts capitalized $ 41.0 $ 32.4