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Net Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net Earnings Per Share - Basic [Abstract]    
Net earnings / (loss) available to common shareholders $ 40.2 $ 35.7
Weighted-average common shares outstanding - basic (in shares) 80.2 81.9
Net earnings / (loss) per share - basic (in dollars per share) $ 0.50 $ 0.44
Net Earnings Per Share - Diluted [Abstract]    
Net earnings / (loss) available to common shareholders $ 40.2 $ 35.7
Weighted-average common shares outstanding - basic (in shares) 80.2 81.9
Effect of dilutive securities - stock options (in shares) 0.4 0.5
Effect of other stock-based awards (in shares) 0.3 1.2
Weighted-average common shares outstanding - diluted (in shares) 80.9 83.6
Net earnings per share - diluted $ 0.50 $ 0.43
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) 4.1 1.6