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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net Income (loss) $ 10.3 $ (34.5)
Weighted average number of shares outstanding - basic 142,900,000 142,000,000
Dilutive effect of stock warrants 300,000 0
Dilutive effect of employee stock plans 2,000,000 0
Incremental Common Shares Attributable to Dilutive Effect, Total 2,300,000 0
Weighted average number of shares outstanding - diluted 145,200,000 142,000,000
Net income (loss) per share - basic $ 0.07 $ (0.24)
Net income (loss) per share - diluted $ 0.07 $ (0.24)
Antidilutive securities excluded from computation of earnings per share 2,600,000 5,200,000
Warrants outstanding 227,129