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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net loss $ (26.9) $ (24.2)
Other comprehensive income (loss), net of income taxes:    
Foreign currency translation loss 0.0 (2.3)
Unrealized income on marketable debt securities 0.1 0.0
Total other comprehensive income (loss), net 0.1 (2.3)
Comprehensive loss $ (26.8) $ (26.5)