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Long-Term Debt and Credit Facility (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Principal amount, carrying amount, and interest expense of the notes
The following tables provide additional information regarding the Convertible Notes:
 
June 30, 2013
 
December 31, 2012
Principal amount
$
175.0

 
$
175.0

Less: unamortized issuance discount
(15.7
)
 
(19.7
)
Carrying amount, net of discount
$
159.3

 
$
155.3


 
Quarter Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Contractual coupon interest
$
1.9

 
$
1.9

 
$
3.9

 
$
3.9

Amortization of discount and deferred financing costs
2.4

 
2.1

 
4.6

 
4.1

Total interest expense1
$
4.3

 
$
4.0

 
$
8.5

 
$
8.0

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