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Long-Term Debt and Credit Facility (Tables)
 9 Months Ended
Sep. 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:
 
September 30, 2013
 
December 31, 2012
Principal amount
$
175.0

 
$
175.0

Less: unamortized issuance discount
(13.6
)
 
(19.7
)
Carrying amount, net of discount
$
161.4

 
$
155.3


 
Quarter Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Contractual coupon interest
$
2.0

 
$
2.0

 
$
5.9

 
$
5.9

Amortization of discount
2.0

 
1.9

 
6.0

 
5.4

Amortization of deferred financing costs
0.3

 
0.3

 
0.9

 
0.9

Total interest expense1
$
4.3

 
$
4.2

 
$
12.8

 
$
12.2

____________
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.