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Earnings Per Share: (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Net Income |  |  |  |
Income from continuing operations | $ 19.0 | $ 18.4 | $ 36.3 | $ 39.1
(Loss) income from discontinued operations | 0.1 | (9.7) | (6.0) | (6.5)
Net Income | $ 19.1 | $ 8.7 | $ 30.3 | $ 32.6
Weighted Average Common Shares |  |  |  |
Income From Continuing Operations, Basic (in shares) | 42.5 | 41.7 | 42.2 | 41.6
(Loss) income from discontinued operations, Basic (in shares) | 42.5 | 41.7 | 42.2 | 41.6
Effect of Dilutive Securities (in shares) | 0.3 | 0.4 | 0.4 | 0.4
Income From Continuing Operations, Diluted (in shares) | 42.8 | 42.1 | 42.6 | 42.0
(Loss) income from discontinued operations, Diluted (in shares) | 42.8 | 42.1 | 42.6 | 42.0
Per Common Share Amount, Basic |  |  |  |
Continuing operations (in dollars per share) | $ 0.45 | $ 0.44 | $ 0.86 | $ 0.94
(Loss) income from discontinued operations (in dollars per share) |  | $ (0.23) | $ (0.14) | $ (0.16)
Net income (in dollars per share) | $ 0.45 | $ 0.21 | $ 0.72 | $ 0.78
Per Common Share Amount, Diluted |  |  |  |
Continuing operations (in dollars per share) | $ 0.45 | $ 0.44 | $ 0.85 | $ 0.94
(Loss) income from discontinued operations (in dollars per share) |  | $ (0.23) | $ (0.14) | $ (0.17)
Net income (in dollars per share) | $ 0.45 | $ 0.21 | $ 0.71 | $ 0.77
Stock options |  |  |  |
Earnings Per Share ("EPS") |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 0.5 | 1.4 | 0.5 | 1.2

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