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

 
$
175.0

Less: unamortized issuance discount1
(11.5
)
 
(19.7
)
Carrying amount, net of discount
$
163.5

 
$
155.3

________________
1    The remaining unamortized issuance discount at December 31, 2013 will be amortized over the next 1.3 years assuming no early conversion.
 
Year Ended December 31,
 
2013
 
2012
 
2011
Contractual coupon interest
$
7.9

 
$
7.9

 
$
8.4

Amortization of discount
8.2

 
7.3

 
6.6

Amortization of deferred financing costs
1.2

 
1.2

 
1.2

Total interest expense1
$
17.3

 
$
16.4

 
$
16.2


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