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Net Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net Earnings Per Share - Basic [Abstract]        
Net earnings available to common shareholders $ 41.0 $ 72.7 $ 81.2 $ 108.4
Weighted-average common shares outstanding - basic (in shares) 80.1 82.0 80.1 82.0
Net earnings / (loss) per share - basic (in dollars per share) $ 0.51 $ 0.89 $ 1.01 $ 1.32
Net Earnings Per Share - Diluted [Abstract]        
Net earnings available to common shareholders $ 41.0 $ 72.7 $ 81.2 $ 108.4
Weighted-average common shares outstanding - basic (in shares) 80.1 82.0 80.1 82.0
Effect of dilutive securities - stock options (in shares) 0.2 1.0 0.3 1.1
Effect of other share-based awards (in shares) 0.1 0.3 0.4 0.6
Weighted-average common shares outstanding - diluted (in shares) 80.4 83.3 80.8 83.7
Net earnings per share - diluted (in dollars per share) $ 0.51 $ 0.87 $ 1.01 $ 1.30
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) 4.2 1.7 4.2 1.7