Exhibit 12.1

	Three months ended				Six months ended		Year ended		Year ended		Year ended		Year ended		Year ended
	March 31, 2016		June 30, 2016		June 30, 2016		December 31, 2015		December 31, 2014		December 31, 2013		December 31, 2012		December 31, 2011
	$		$		$		$		$		$		$		$
Available earnings:
Earnings before income taxes and equity earnings		1		24		25		156		261		72		236		505
Add fixed charges:
Interest expense incurred		16		15		31		87		99		83		75		76
Amortization of debt expense and discount		1		—		1		6		4		4		8		7
Interest portion of rental expense(1)		2		2		4		9		11		11		11		11
Total earnings as defined		20		41		61		258		375		170		330		599
Fixed charges:
Interest expense incurred		16		15		31		87		99		83		75		76
Amortization of debt expense and discount		1		—		1		6		4		4		8		7
Interest portion of rental expense(1)		2		2		4		9		11		11		11		11
Total fixed charges		19		17		36		102		114		98		94		94
Preferred stock dividends		—		—		—		—		—		—		—		—
Combined fixed charges and preferred dividends		19		17		36		102		114		98		94		94
Ratio of earnings to fixed charges		1.1		2.4		1.7		2.5		3.3		1.7		3.5		6.4
Deficiency in the coverage of earnings to fixed charges
Ratio of earnings to combined fixed charges and preferred dividends		1.1		2.4		1.7		2.5		3.3		1.7		3.5		6.4
Deficiency in the coverage of earnings to combined fixed charges and preferred dividends

(1) Interest portion of rental expense is calculated based on the proportion deemed representation of the interest component (i.e. 1/3 of rental expense).