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Net Earnings Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net Earnings Per Share - Basic [Abstract]
Net earnings / (loss) available to common shareholders	$ 79.6	$ 51.3	$ 188.0	$ 86.8
Weighted-average common shares outstanding - basic (in shares)	81.7	81.9	81.9	80.7
Net earnings / (loss) per share - basic (in dollars per share)	$ 0.97	$ 0.63	$ 2.30	$ 1.08
Net Earnings Per Share - Diluted [Abstract]
Net earnings / (loss) available to common shareholders	$ 79.6	$ 51.3	$ 188.0	$ 86.8
Weighted-average common shares outstanding - basic (in shares)	81.7	81.9	81.9	80.7
Effect of dilutive securities - stock options (in shares)	0.4	0.6	0.9	0.8
Effect of other stock-based awards (in shares)	0.3	0.2	0.5	0.2
Weighted-average common shares outstanding - diluted (in shares)	82.4	82.7	83.3	81.7
Net earnings per share - diluted	$ 0.97	$ 0.62	$ 2.26	$ 1.06
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)	3.9	3.2	2.5	3.2

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