Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year ended December 31,
	2014		2013		2012			2011		2010
	(millions except ratios)
Income (loss) from continuing operations before income taxes, interest in earnings of associates and noncontrolling interests	$	518	$	499	$	(337	)	$	239	$	587
Add back fixed charges:
Total fixed charges	175		168		169			197		208
Dividends from associates	3		3		3			7		5
Less:
Capitalized interest	—		—		—			—		—
Income (loss) as adjusted	$	696	$	670	$	(165	)	$	443	$	800
Fixed charges
Interest expense	$	135	$	126	$	128		$	156	$	166
Portions of rents representative of interest factor	40		42		41			41		42
Total fixed charges	$	175	$	168	$	169		$	197	$	208
Ratio of earnings to fixed charges	4.0		4.0		(1.0		)	2.2		3.8

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

	Year ended December 31,
	2014		2013		2012			2011		2010
	(millions except ratios)
Income (loss) from continuing operations before income taxes, interest in earnings of associates and noncontrolling interests	$	518	$	499	$	(337	)	$	239	$	587
Add back fixed charges:
Total fixed charges	175		168		169			197		208
Dividends from associates	3		3		3			7		5
Less:
Capitalized interest	—		—		—			—		—
Income (loss) as adjusted	$	696	$	670	$	(165	)	$	443	$	800
Fixed charges and preferred stock dividends
Interest expense	$	135	$	126	$	128		$	156	$	166
Portions of rents representative of interest factor	40		$	42	$	41		$	41	$	42
Total fixed charges	175		$	168	$	169		$	197	$	208
Preferred stock dividends	—		$	—	$	—		$	—	$	—
Total fixed charges and preferred stock dividends	$	175	$	168	$	169		$	197	$	208
Ratio of earnings to fixed charges and preferred stock dividends	4.0		4.0		(1.0		)	2.2		3.8