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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net Income (loss) | $ (19.5) | $ 2.1 | $ (54.0) | $ (12.1)
Average shares of stock outstanding - basic and diluted | 142,300,000 | 140,800,000 | 142,100,000 | 140,800,000
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants |  | 1,300,000 |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements |  | 1,900,000 |  |
Weighted Average Number of Shares Outstanding, Diluted | 142,300,000 | 144,000,000 | 142,100,000 | 140,800,000
Net income (loss) per share - basic | $ (0.14) | $ 0.01 | $ (0.38) | $ (0.09)
Diluted earnings per share: |  |  |  |
Antidilutive securities excluded from computation of earnings per share | 5,100,000 | 4,100,000 | 5,100,000 | 3,500,000
Warrants outstanding | 573,521 |  | 573,521 |

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