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Net Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Earnings Per Share - Basic [Abstract]
Net earnings available to common shareholders	$ 94.7	$ 63.1	$ 186.8	$ 144.3
Weighted-average common shares outstanding - basic (in shares)	78.4	79.5	77.6	79.9
Net earnings per share - basic (in dollars per share)	$ 1.21	$ 0.79	$ 2.41	$ 1.81
Net Earnings Per Share - Diluted [Abstract]
Effect of dilutive securities - stock options (in shares)	0.8	0.3	0.8	0.3
Effect of other share-based awards (in shares)	0.8	0.2	0.8	0.4
Weighted-average common shares outstanding - diluted (in shares)	80.0	80.0	79.2	80.6
Net earnings per share - diluted (in dollars per share)	$ 1.18	$ 0.79	$ 2.36	$ 1.79
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)	1.0	4.2	1.1	4.2

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