Exhibit 12.1

Statement of Computation of Ratios of Earnings to Fixed Charges

	Three Months Ended March 31,		Year Ended December 31,
	2010		2009		2008		2007		2006		2005
Earnings:
Income before income taxes	$	116.2	$	865.0	$	159.3	$	468.1	$	443.7	$	409.2
Interest expense		134.5		595.9		131.9		94.8		95.8		81.0
Interest component of rent		3.2		14.2		3.1		2.6		2.9		3.2
Total earnings for ratio		253.9	$	1,475.1	$	294.3	$	565.5	$	542.4	$	493.4
Fixed Charges:
Interest expense	$	134.5	$	595.9	$	131.9	$	94.8	$	95.8	$	81.0
Capitalized interest		0.9		7.8		2.6		3.0		2.7		2.0
Interest component of rent		3.2		14.2		3.1		2.6		2.9		3.2
Total interest for ratio		138.6	$	617.9	$	137.6	$	100.4	$	101.4	$	86.2
Earnings to fixed charges		1.83		2.39		2.14		5.63		5.35		5.72