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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS      
Foreign currency translation adjustments, tax $ (1.1) $ 0.7 $ 0.5