Stockholders' Equity of the Company (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Schedule of Stockholders Equity

The following table sets forth information regarding sales of our common stock under our at-the-market offering program for the three and nine months ended September 30, 2013:

	Three Months Ended September 30, 2013		Nine Months Ended September 30, 2013
	(in millions, except share and per share data)
Common shares sold during the period	226,430		1,040,838
Weighted average price per common share	$	51.12	$	53.11
Aggregate gross proceeds	$	11.6	$	55.3
Aggregate net proceeds after sales agent compensation	$	11.4	$	54.4