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Consolidated Statement Of Operations Parenthetical - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Operating expenses        
Selling, general and administrative, charges from affiliates $ 24.0 $ 22.9 $ 43.7 $ 44.1