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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, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Net Earnings / (Loss) Per Share - Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings / (loss) available to common shareholders | $ 63.6 | $ 79.6 | $ 72.7 | $ 35.7 | $ (350.4) | $ 51.3 | $ 32.7 | $ 2.8 | $ 251.6 | $ (263.6) | $ (9.2)
Weighted-average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 81,600,000 | 81,000,000 | 78,300,000
Net earnings / (loss) per share - basic (in dollars per share) | $ 0.79 | $ 0.97 | $ 0.89 | $ 0.44 | $ (4.29) | $ 0.63 | $ 0.40 | $ 0.04 | $ 3.08 | $ (3.26) | $ (0.12)
Net Earnings / (Loss) Per Share - Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings / (loss) available to common shareholders | $ 63.6 | $ 79.6 | $ 72.7 | $ 35.7 | $ (350.4) | $ 51.3 | $ 32.7 | $ 2.8 | $ 251.6 | $ (263.6) | $ (9.2)
Weighted-average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 81,600,000 | 81,000,000 | 78,300,000
Effect of dilutive securities - stock options (in shares) |  |  |  |  |  |  |  |  | 700,000 | 0 | 0
Effect of other share-based awards (in shares) |  |  |  |  |  |  |  |  | 500,000 | 0 | 0
Weighted-average common shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  | 82,800,000 | 81,000,000 | 78,300,000
Net earnings / (loss) per share - diluted (in dollars per share) | $ 0.78 | $ 0.97 | $ 0.87 | $ 0.43 | $ (4.29) | $ 0.62 | $ 0.40 | $ 0.04 | $ 3.04 | $ (3.26) | $ (0.12)
Stock-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) |  |  |  |  |  |  |  |  | 3,074,000 | 6,583,000 | 6,231,000
Exercise price range, minimum (in dollars per share) |  |  |  |  |  |  |  |  | $ 52 | $ 11 | $ 9
Exercise price range, maximum (in dollars pre share) |  |  |  |  |  |  |  |  | $ 93 | $ 93 | $ 93
Weighted-average remaining life (in years) | 6.3 |  |  |  | 5.8 |  |  |  | 6.3 | 5.8 | 6.2

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 20 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 7 -Paragraph 18 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 + Details
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