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Earnings Per Share
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in millions, except per share data):
 
Three Months Ended March 31
 
 
2017
 
2016
 
Numerator:
 
 
 
 
Net income
$
117.4

 
$
103.7

 
Less: distributed and undistributed earnings allocated to participating securities
(1.0
)
 
(1.1
)
 
Net income attributable to common shareholders
$
116.4

 
$
102.6

 
Denominator:
 
 
 
 
Weighted average basic common shares outstanding
93.4

 
94.1

 
Effect of dilutive securities
0.2

 
0.1

 
Weighted average diluted common shares outstanding
93.6

 
94.2

 
Basic income per common share
$
1.25

 
$
1.09

 
Diluted income per common share
$
1.24

 
$
1.09