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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