Net Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Earnings Per Share - Basic [Abstract]
Net earnings available to common shareholders	$ 130.5	$ 94.7	$ 310.4	$ 186.8
Weighted-average common shares outstanding (in shares)	79.7	78.4	79.8	77.6
Net earnings per share - basic (in dollars per share)	$ 1.64	$ 1.21	$ 3.89	$ 2.41
Net Earnings Per Share - Diluted [Abstract]
Net earnings available to common shareholders	$ 130.5	$ 94.7	$ 310.4	$ 186.8
Weighted-average common shares outstanding (in shares)	79.7	78.4	79.8	77.6
Effect of dilutive securities - stock options (in shares)	0.6	0.8	0.7	0.8
Effect of other share-based awards (in shares)	0.8	0.8	0.8	0.8
Weighted-average common shares outstanding - diluted (in shares)	81.1	80.0	81.3	79.2
Net earnings per share - diluted (in dollars per share)	$ 1.61	$ 1.18	$ 3.82	$ 2.36
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)	0.1	1.0	0.2	1.1