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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Basic and dilutive earnings per share calculation
The following table illustrates the basic and dilutive EPS calculations for the three years ended December 31, 2017:
 
 
Year Ended December 31,
(In millions, except per share data)
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
 
   Reported net income (Numerator for Basic and Diluted EPS)
 
$
216.0

 
$
211.6

 
$
197.3

Denominator:
 
 

 
 

 
 

Weighted-average common shares outstanding (Basic and Diluted EPS)
 
83.0

 
82.8

 
82.7

 
 
 
 
 
 
 
Basic and diluted earnings per share
 
$
2.60

 
$
2.55

 
$
2.39