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

 
$
175.0

Less: unamortized issuance discount
(2.5
)
 
(11.5
)
Carrying amount, net of discount
$
172.5

 
$
163.5


 
Year Ended December 31,
 
2014
 
2013
 
2012
Contractual coupon interest
$
7.9

 
$
7.9

 
$
7.9

Amortization of discount
9.1

 
8.2

 
7.3

Amortization of deferred financing costs
1.1

 
1.2

 
1.2

Total interest expense1
$
18.1

 
$
17.3

 
$
16.4


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