Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year ended December 31,
	2017		2016		2015		2014		2013
	(in millions except ratios)
Income from operations before income taxes and interest in earnings of associates	$	489	$	340	$	340	$	518	$	499
Add back fixed charges:
Total fixed charges	279		275		183		175		168
Dividends from associates	1		3		4		3		3
Less:
Capitalized interest	—		—		—		—		—
Income as adjusted	$	769	$	618	$	527	$	696	$	670
Fixed charges
Interest expense	$	188	$	184	$	142	$	135	$	126
Portions of rents representative of interest factor	91		91		43		40		42
Total fixed charges	$	279	$	275	$	185	$	175	$	168
Ratio of earnings to fixed charges	2.8		2.2		2.8		4.0		4.0

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

	Year ended December 31,
	2017		2016		2015		2014		2013
	(in millions except ratios)
Income from operations before income taxes and interest in earnings of associates	$	489	$	340	$	340	$	518	$	499
Add back fixed charges:
Total fixed charges	279		275		183		175		168
Dividends from associates	1		3		4		3		3
Less:
Capitalized interest	—		—		—		—		—
Income as adjusted	$	769	$	618	$	527	$	696	$	670
Fixed charges and preferred stock dividends
Interest expense	$	188	$	184	$	142	$	135	$	126
Portions of rents representative of interest factor	91		91		$	43	$	40	$	42
Total fixed charges	279		275		$	185	$	175	$	168
Preferred stock dividends	—		—		$	—	$	—	$	—
Total fixed charges and preferred stock dividends	$	279	$	275	$	185	$	175	$	168
Ratio of earnings to fixed charges and preferred stock dividends	2.8		2.2		2.8		4.0		4.0