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Divestitures (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2008
Tax charges from spinoff $ (8,600,000) $ (4,800,000) $ 1,100,000  
Goodwill, Impairment Loss 0 0   $ 2,496,000,000
Change in noncontrolling interest from distribution 15,800,000 14,100,000 9,400,000  
Gain (loss) on sale/asset impairment $ (8,400,000) $ 0 $ 0