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Long-Term Debt and Credit Facility (Tables)
 6 Months Ended
Jun. 30, 2015
Debt Disclosure [Abstract]  
Principal amount, carrying amount, and interest expense of the notes
The following table provides additional information regarding the Convertible Notes (in millions of dollars):
 
Quarter Ended
June 30,
 
Six Months Ended
June 30,
 
2015
 
2014
 
2015
 
2014
Contractual coupon interest
$
—

 
$
1.9

 
$
2.0

 
$
3.9

Amortization of discount
—

 
2.3

 
2.4

 
4.4

Amortization of deferred financing costs
—

 
0.3

 
0.3

 
0.6

Total interest expense1
$
—

 
$
4.5

 
$
4.7

 
$
8.9

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