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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share [Abstract] |  |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | $ (86.0) | $ (73.4) | $ 177.4
Loss from discontinued operations | (2.1) | (2.0) | (0.3)
Net income (loss) | (88.1) | (75.4) | 177.1
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ (88.1) | $ (75.4) | $ 177.1
Weighted average number of shares outstanding - basic | 142.4 | 141.1 | 139.6
Dilutive effect of employee stock plans | 0.0 | 0.0 | 2.5
Dilutive effect of stock warrants | 0.0 | 0.0 | 2.2
Earnings per share, potentially dilutive | 0 | 0 | 4.7
Weighted Average Number Diluted Shares Outstanding Adjustment | 142.4 | 141.1 | 144.3
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 4.9 | 5.8 | 2.5
Income (loss) per share from continuing operations | $ (0.60) | $ (0.52) | $ 1.27
Loss per share from discontinued operations | (0.02) | (0.01) | 0.00
Earnings Per Share, Basic | (0.62) | (0.53) | 1.27
Income (loss) per share from continuing operations | (0.60) | (0.52) | 1.23
Loss per share from discontinued operations | (0.02) | (0.01) | 0.00
Net income (loss) per share - diluted | $ (0.62) | $ (0.53) | $ 1.23

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