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Cash Convertible Senior Notes and Related Transactions (Tables)
 12 Months Ended
Dec. 31, 2011
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:
 
December 31,
2011
 
December 31,
2010
Principal amount
$
175.0

 
$
175.0

Less: unamortized issuance discount
$
(27.0
)
 
(33.6
)
Carrying amount, net of discount
$
148.0

 
$
141.4


 
Year Ended
 
December 31,
 
2011
 
2010
Contractual coupon interest
$
8.4

 
$
6.0

Amortization of discount and deferred financing costs
7.8

 
5.3

Total interest expense1
$
16.2

 
$
11.3

____________

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