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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS        
Foreign currency translation adjustments, tax $ 0.3 $ (0.2) $ 0.3 $ (0.4)