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Selected Quarterly Financial Data (Unaudited) (Schedule Of Quarterly Results Of Operations ) (Parenthetical) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 13, 2016
Dec. 31, 2016
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]      
Equity contribution $ 5.8 $ 5.8 $ 5.8