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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Income Per Common 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).
 
Year Ended December 31
 
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Net income
$
449.6

 
$
436.8

 
$
392.6

Less: distributed and undistributed earnings allocated to participating securities
(4.4
)
 
(5.2
)
 
(5.7
)
Net income attributable to common shareholders
$
445.2

 
$
431.6

 
$
386.9

Denominator:
 

 
 

 
 

Weighted average basic common shares outstanding
93.5

 
96.6

 
97.0

Effect of dilutive securities
0.2

 
0.1

 
0.1

Diluted common shares outstanding
93.7

 
96.7

 
97.1

Basic income per common share
$
4.76

 
$
4.47

 
$
3.99

Diluted income per common share
$
4.75

 
$
4.47

 
$
3.99