Debt (Tables)

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

Principal amount, carrying amount, and interest expense of the notes

The following tables provide additional information regarding the Convertible Notes:

	September 30, 2012			December 31, 2011
Principal amount	$	175.0		$	175.0
Less: unamortized issuance discount	(21.6		)	(27.0		)
Carrying amount, net of discount	$	153.4		$	148.0