Net Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Earnings Per Share - Basic [Abstract]
Net earnings available to common shareholders	$ 109.8	$ 68.2	$ 179.9	$ 92.1
Weighted-average common shares outstanding (in shares)	79.9	77.4	79.9	77.3
Net earnings per share - basic (in dollars per share)	$ 1.37	$ 0.88	$ 2.25	$ 1.19
Net Earnings Per Share - Diluted [Abstract]
Net earnings available to common shareholders	$ 109.8	$ 68.2	$ 179.9	$ 92.1
Weighted-average common shares outstanding (in shares)	79.9	77.4	79.9	77.3
Effect of dilutive securities - stock options (in shares)	0.7	0.6	0.7	0.6
Effect of other share-based awards (in shares)	0.8	0.6	0.8	0.7
Weighted-average common shares outstanding - diluted (in shares)	81.4	78.6	81.4	78.6
Net earnings per share - diluted (in dollars per share)	$ 1.35	$ 0.87	$ 2.21	$ 1.17
Share-based awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share - Diluted [Line Items]
Antidilutive securities excluded from the calculation of Net Earnings Per Share - Diluted (in shares)	0.2	2.1	0.2	2.3