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Earnings Per Share ("EPS")
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Earnings Per Share (EPS)
Earnings Per Share (“EPS”)
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
(in millions)
 
2015
 
2014
 
2015
 
2014
Net income
 
$
22.2

 
$
22.4

 
$
23.3

 
$
30.8

 
 
 
 
 
 
 
 
 
Weighted average shares for basic EPS
 
137.4

 
119.7

 
137.1

 
108.4

Dilutive potential shares from grants of RSUs, PRSUs and stock options(a)
 
0.4

 
0.2

 
0.5

 
0.2

Weighted average shares for diluted EPS
 
137.8

 
119.9

 
137.6

 
108.6


(a)
The potential impact of an aggregate 0.2 million granted RSUs, PRSUs and stock options for the three months ended June 30, 2015, and an aggregate 0.1 million granted RSUs, PRSUs and stock options for the six months ended June 30, 2015, were antidilutive.