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Stockholders' Equity of the Company (Tables)
9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Common stock under at-the-market offering programs
The following table sets forth information regarding sales of common stock under our at-the-market offering programs for the nine months ended September 30, 2018:

 
Nine Months Ended September 30, 2018
 
(in millions, except share and per share data)
Shares of common stock sold during the period
1,817,195

Weighted average price per common share
$
73.64

Aggregate gross proceeds
$
133.8

Aggregate net proceeds after selling commissions
$
132.1