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Net Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net Earnings Per Share - Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings available to common shareholders | $ 53.3 |  | $ 63.1 |  | $ 41.0 |  | $ 40.2 |  | $ 63.6 |  | $ 79.6 |  | $ 72.7 |  | $ 35.7 |  | $ 197.6 |  | $ 251.6 |  | $ (263.6)
Weighted-average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,500,000 |  | 81,600,000 |  | 81,000,000
Net earnings per share - basic (in dollars per share) | $ 0.68 |  | $ 0.79 |  | $ 0.51 |  | $ 0.50 |  | $ 0.79 |  | $ 0.97 |  | $ 0.89 |  | $ 0.44 |  | $ 2.49 |  | $ 3.08 |  | $ (3.26)
Net Earnings Per Share - Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings available to common shareholders | $ 53.3 |  | $ 63.1 |  | $ 41.0 |  | $ 40.2 |  | $ 63.6 |  | $ 79.6 |  | $ 72.7 |  | $ 35.7 |  | $ 197.6 |  | $ 251.6 |  | $ (263.6)
Weighted-average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,500,000 |  | 81,600,000 |  | 81,000,000
Effect of dilutive securities - stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  | 700,000 |  | 0
Effect of other share-based awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  | 500,000 |  | 0
Weighted-average common shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,100,000 |  | 82,800,000 |  | 81,000,000
Net earnings per share - diluted (in dollars per share) | $ 0.68 | [1] | $ 0.79 | [1] | $ 0.51 | [1] | $ 0.50 | [1] | $ 0.78 | [2] | $ 0.97 | [2] | $ 0.87 | [2] | $ 0.43 | [2] | $ 2.47 | [1] | $ 3.04 | [2] | $ (3.26)
Share-based awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from the calculation of Net Earnings Per Share (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,257,000 |  | 3,074,000 |  | 6,583,000
Weighted-average remaining life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years 9 months 18 days |  | 6 years 3 months 18 days |  | 5 years 9 months 18 days
Share-based awards [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40 |  | $ 52 |  | $ 11
Share-based awards [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 93 |  | $ 93 |  | $ 93
[1] | Included in the results are reorganization costs of ($0.17) per diluted share in the second quarter and ($0.23) per diluted share in the fourth quarter.
[2] | Included in the results are reorganization costs of ($0.02) per diluted share in the second quarter and ($0.20) per diluted share in the fourth quarter.

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