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Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Results [Abstract]

The following table sets forth selected unaudited quarterly data for the periods shown (U.S. dollars in millions, except per share amounts):

		2011																2012
		1^st Quarter				2^nd Quarter				3^rd Quarter				4^th Quarter				1^st Quarter				2^nd Quarter				3^rd Quarter				4^th Quarter

Revenue		$	395.8			$	424.4			$	428.4			$	495.3			$	462.0			$	593.2			$	526.2			$	588.3
Gross profit			295.2				353.3				357.8				415.1				386.2				497.7				439.4				493.2
Operating income			24.9				66.0				67.2				75.6				71.6				97.9				82.4				88.9
Net income			15.3				41.7				46.8				49.5				47.8				60.4				54.2				59.2
Net income per share:
Basic			0.25				0.67				0.75				0.80				0.77				0.98				0.90				1.01
Diluted			0.24				0.65				0.72				0.76				0.74				0.94				0.87				0.97