Net Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 65.7	$ 70.1
Weighted-average common shares outstanding [Abstract]
Weighted-average common shares outstanding - basic (in shares)	78.7	79.8
Effect of dilutive securities - stock options (in shares)	0.5	0.7
Effect of other share-based awards (in shares)	0.4	0.7
Weighted-average common shares outstanding - diluted (in shares)	79.6	81.2
Net earnings per share - basic (in dollars per share)	$ 0.83	$ 0.88
Net earnings per share - diluted (in dollars per share)	$ 0.83	$ 0.86
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)	0.7	0.1