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Long-Term Debt and Credit Facility (Tables)
 6 Months Ended
Jun. 30, 2014
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, 2014
 
December 31, 2013
Principal amount
$
175.0

 
$
175.0

Less: unamortized issuance discount
(7.1
)
 
(11.5
)
Carrying amount, net of discount
$
167.9

 
$
163.5


 
Quarter Ended
June 30,
 
Six Months Ended
June 30,
 
2014
 
2013
 
2014
 
2013
Contractual coupon interest
$
1.9

 
$
1.9

 
$
3.9

 
$
3.9

Amortization of discount
2.3

 
2.1

 
4.4

 
4.0

Amortization of deferred financing costs
0.3

 
0.3

 
0.6

 
0.6

Total interest expense1
$
4.5

 
$
4.3

 
$
8.9

 
$
8.5

____________
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.