Twelve months ended December 31, (in millions, except per share data)	2007	2006	2005
Net Sales	$ 1,091.0	$ 1,037.0	$ 997.9
Cost of goods sold	378.2	373.6	374.6
Gross profit	712.9	663.4	623.3
Selling, general and administrative expenses	418.0	376.0	348.7
Research and development expenses	122.3	114.2	99.0
Purchased in process research and development expenses	—	—	1.2
Special (gains) charges, net (Note 4)	23.3	(4.5)	48.2
Interest expense	9.1	10.5	12.3
Interest income	(7.7)	(7.8)	(2.6)
Other (income) expense, net (Note 15)	(1.9)	2.7	(0.2)
Income before provision for income taxes	149.8	172.3	116.7
Provision for income taxes	36.8	41.8	37.4
Net income	$ 113.0	$ 130.5	$ 79.3
Share information (Note 2):
Earnings per share:
Basic	$ 1.97	$ 2.23	$ 1.33
Diluted	$ 1.87	$ 2.10	$ 1.27
Weighted average number of common shares outstanding:
Basic	57.3	58.5	59.6
Diluted	62.7	63.9	62.3