Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year ended December 31,
	2015		2014		2013		2012			2011
	(millions except ratios)
Income (loss) from continuing operations before income taxes, interest in earnings of associates and noncontrolling interests	$	340	$	518	$	499	$	(337	)	$	239
Add back fixed charges:
Total fixed charges		185		175		168		169			197
Dividends from associates		4		3		3		3			7
Less:
Capitalized interest		—		—		—		—			—
Income (loss) as adjusted	$	529	$	696	$	670	$	(165	)	$	443
Fixed charges
Interest expense	$	142	$	135	$	126	$	128		$	156
Portions of rents representative of interest factor		43		40		42		41			41
Total fixed charges	$	185	$	175	$	168	$	169		$	197
Ratio of earnings to fixed charges		2.9		4.0		4.0		(1.0	)		2.2

COMPUTATION OF RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

	Year ended December 31,
	2015		2014		2013		2012			2011
	(millions except ratios)
Income (loss) from continuing operations before income taxes, interest in earnings of associates and noncontrolling interests	$	340	$	518	$	499	$	(337	)	$	239
Add back fixed charges:
Total fixed charges		185		175		168		169			197
Dividends from associates		4		3		3		3			7
Less:
Capitalized interest		—		—		—		—			—
Income (loss) as adjusted	$	529	$	696	$	670	$	(165	)	$	443
Fixed charges and preferred stock dividends
Interest expense	$	142	$	135	$	126	$	128		$	156
Portions of rents representative of interest factor		43		40		42		41			41
Total fixed charges		185		175	$	168	$	169		$	197
Preferred stock dividends		—		—		—		—			—
Total fixed charges and preferred stock dividends	$	185	$	175	$	168	$	169		$	197
Ratio of earnings to fixed charges and preferred stock dividends		2.9		4.0		4.0		(1.0	)		2.2