EXHIBIT 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(Dollars in millions, except ratio amounts)

	Three Months Ended March 31,					Years Ended December 31,
	2012			2011		2011		2010			2009			2008			2007
Income (loss) from continuing operations before tax		237.5			171.2		696.8		405.5			(94.2	)		439.6			264.7
Share of undistributed (losses) income from 50%-or-less-owned affiliates, excluding affiliates with guaranteed debt		(0.1	)		—		0.5		(0.2	)		0.9			(1.4	)		1.3
Amortization of capitalized interest		0.5			0.5		2.0		2.0			1.9			1.8			1.4
Interest expense		8.6			9.8		36.8		38.2			41.9			44.4			42.3
Interest portion of rental expense		2.1			1.8		7.2		8.0			8.5			8.7			7.5
Earnings (loss)		248.6			183.3		743.3		453.5			(41.0	)		493.1			317.2
Interest		9.2			9.9		38.0		38.9			43.7			47.4			48.0
Interest portion of rental expense		2.1			1.8		7.2		8.0			8.5			8.7			7.5
Fixed Charges		11.3			11.7		45.2		46.9			52.2			56.1			55.5
Ratio of Earnings to Fixed Charges		22.0			15.67		16.44		9.67			(0.79	)		8.79			5.72