Debt and Credit Facility (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of additional information regarding the convertible notes

The following table provides additional information regarding the Convertible Notes (in millions of dollars):

	Year Ended December 31,
	2015		2014		2013
Contractual coupon interest	$	2.0	$	7.9	$	7.9
Amortization of discount	2.4		9.1		8.2
Amortization of deferred financing costs	0.3		1.1		1.2
Total interest expense1	$	4.7	$	18.1	$	17.3

_______________

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