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Net Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net earnings available to common shareholders	$ 71.7	$ 65.7
Weighted-average common shares outstanding (in millions)
Weighted-average common shares outstanding - basic (in shares)	72.8	78.7
Weighted-average common shares outstanding - diluted (in shares)	73.5	79.6
Net earnings per share - basic (in dollars per share)	$ 0.98	$ 0.83
Net earnings per share - diluted (in dollars per share)	$ 0.98	$ 0.83
Share-based awards
Weighted-average common shares outstanding (in millions)
Antidilutive securities excluded from the calculation of net earnings per share - diluted (in shares)	0.4	0.7
Stock Options
Weighted-average common shares outstanding (in millions)
Effect of dilutive securities	0.3	0.5
Non-Stock Option Awards
Weighted-average common shares outstanding (in millions)
Effect of dilutive securities	0.4	0.4

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