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Net Loss Per Common Share Net Loss per Common Share - Basic and Diluted Net Loss per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator for basic and diluted net loss per share:        
Net loss for basic $ (20.2) $ (3.7) $ (39.4) $ (16.6)
Dilutive potential common stock outstanding:        
Basic and diluted net loss per share $ (0.24) $ (0.05) $ (0.48) $ (0.21)