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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net loss $ (127.1) $ (50.2) $ (65.6)
Other comprehensive income (loss), net of income taxes:      
Foreign currency translation gain (loss) 4.0 (1.4) (0.7)
Unrealized gain (loss) on marketable debt securities 0.1 (0.2) 0.0
Total other comprehensive income (loss), net 4.1 (1.6) (0.7)
Comprehensive loss $ (123.0) $ (51.8) $ (66.3)