Debt and Credit Facility (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of Interest Incurred on Convertible Debt

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

	Year Ended December 31,
	2015		2014
Contractual coupon interest	$	2.0	$	7.9
Amortization of discount	2.4		9.1
Amortization of debt issuance costs	0.3		1.1
Total interest expense1	$	4.7	$	18.1

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