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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2015
Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS    
Accounts receivable other, related parties $ 15.8 $ 32.8
Accounts payable, related parties $ 69.3 $ 69.1
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 2,000.0 2,000.0
Common stock, shares issued 884.6 884.6