Cash Convertible Senior Notes and Related Transactions (Tables)

3 Months Ended

Mar. 31, 2012

Cash Convertible Senior Notes and Related Transactions [Abstract]

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

The following tables provide additional information regarding the Notes:

	March 31, 2012			December 31, 2011
Principal amount	$	175.0		$	175.0
Less: unamortized issuance discount	(25.2		)	(27.0		)
Carrying amount, net of discount	$	149.8		$	148.0

	Quarter Ended
	March 31,
	2012		2011
Contractual coupon interest	$	2.0	$	2.0
Amortization of discount and deferred financing costs	2.0		1.9
Total interest expense1	$	4.0	$	3.9

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¹  A portion of the interest relating to the Notes is capitalized as Construction in progress.