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Earnings 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
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net Income (loss) $ 31.7 $ (19.5) $ 42.0 $ (54.0)
Weighted average number of shares outstanding - basic 143,400,000 142,300,000 143,100,000 142,100,000
Dilutive effect of stock warrants 200,000 0 300,000  
Dilutive effect of employee stock plans 1,600,000 0 1,700,000  
Dilutive potential common shares 1,800,000 0 2,000,000 0
Weighted average number of shares outstanding - diluted 145,200,000 142,300,000 145,100,000 142,100,000
Net income (loss) per share - basic $ 0.22 $ (0.14) $ 0.29 $ (0.38)
Net income (loss) per share - diluted $ 0.22 $ (0.14) $ 0.29 $ (0.38)
Antidilutive securities excluded from computation of earnings per share 2,600,000 5,100,000    
Warrants outstanding 227,129   227,129