Exhibit 12.1

Computation of Ratio of Earnings to Fixed Charges

	Three Months Ended March 31, 2015			Fiscal Year Ended December 31,
				2014		2013		2012		2011		2010
	(dollars in millions)
Earnings:
Income (loss) before income taxes	$	(1.6	)	$	32.6	$	35.8	$	63.5	$	65.0	$	82.6
Interest expense		13.0			45.1		45.1		43.2		40.8		27.5
Portion of rents representative of interest factor		1.1			4.4		5.0		5.0		5.2		4.2
Adjusted income before income taxes	$	12.5		$	82.1	$	85.9	$	111.7	$	111.0	$	114.3
Fixed Charges:
Interest	$	13.0		$	45.1	$	45.1	$	43.2	$	40.8	$	27.5
Portion of rents representative of interest factor		1.1			4.4		5.0		5.0		5.2		4.2
Total fixed charges	$	14.1		$	49.5	$	50.1	$	48.2	$	46.0	$	31.7
Ratio of earnings to fixed charges		N/A			1.7x		1.7x		2.3x		2.4x		3.5x
Coverage Deficiency	$	1.6			—		—		—		—		—