Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Computation of Basic and Diluted Earnings per Share

	Three Months Ended
	March 31,
(in millions, except per share data)	2015		2014
Net income attributable to common shareholders	$	51.1	$	48.7
Average basic shares outstanding	58.1		58.5
Effect of dilutive stock options	0.8		1.0
Average diluted shares outstanding	58.9		59.5
Earnings per basic share	$	0.88	$	0.83
Earnings per diluted share	$	0.87	$	0.82