Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

ACTUAL

	Three months ended March 31,						Years ended December 31,
(millions except ratios)	2005			2004			2004		2003		2002		2001		2000
Income before income taxes, equity in net income of associates and minority interest		$	88		$	212	$	627	$	567	$	354	$	79	$	65
Add back fixed charges:
Total fixed charges		12			12		48		74		86		101		109
Dividends from associates		—			—		7		6		3		4		5
Income as adjusted		$	100		$	224	$	682	$	647	$	443	$	184	$	179
Fixed Charges
Interest expense		$	6		$	5	$	22	$	53	$	65	$	82	$	89
Portion of rents representative of interest factor		6			7		26		21		21		19		20
Total fixed charges		$	12		$	12	$	48	$	74	$	86	$	101	$	109
Ratio of earnings to fixed charges		8.3			18.7		14.2		8.7		5.2		1.8		1.6
Pro forma ratio of earnings to fixed charges		6.7					10.8

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES—PRO FORMA

PRO FORMA v. ACTUAL

	Three months ended March 31,						Year ended December 31,
(millions except ratios)	2005			2005			2004			2004
	ACTUAL			PRO FORMA			ACTUAL			PRO FORMA
Income before income taxes, equity in net income of associates and minority interest		$	88		$	85		$	627		$	612
Add back fixed charges:
Total fixed charges		12			15			48			63
Dividends from associates		—			—			7			7
Income as adjusted		$	100		$	100		$	682		$	682
Fixed Charges
Interest expense		$	6		$	9		$	22		$	37
Portion of rents representative of interest factor		6			6			26			26
Total fixed charges		$	12		$	15		$	48		$	63
Ratio of earnings to fixed charges		8.3			6.7			14.2			10.8