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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Share
 
Three Months Ended
 
March 31,
(in millions, except per share data)
2016
 
2015
Net income attributable to common shareholders
$
55.0

 
$
51.1

 
 
 
 
Average basic shares outstanding
58.2

 
58.1

Effect of dilutive stock options
0.7

 
0.8

Average diluted shares outstanding
58.9

 
58.9

 
 
 
 
Earnings per basic share
$
0.95

 
$
0.88

Earnings per diluted share
$
0.93

 
$
0.87