Stockholders' Equity of the Company (Tables)

9 Months Ended

Sep. 30, 2015

Class of Stock [Line Items]

Schedule of Stockholders Equity [Table Text Block]

The following table sets forth information regarding sales of our common stock under our at-the-market offering program for the nine months ended September 30, 2015:

	Nine months  ended September 30, 2015
	(in millions, except share and per share data)
Shares of common stock sold during the period	1,866,267
Weighted average price per common share	$	75.06
Aggregate gross proceeds	$	140.1
Aggregate net proceeds after sales agent compensation	$	138.2