Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net sales	$ 8,114.9	$ 7,266.8	$ 6,531.6
Cost of goods sold	7,680.8	6,881.5	6,130.0
Gross profit	434.1	385.3	401.6
Warehousing and distribution expenses	234.6	211.8	197.3
Selling, general and administrative expenses	150.8	142.5	137.3
Amortization of intangible assets	3.0	2.1	2.0
Total operating expenses	388.4	356.4	336.6
Income from operations	45.7	28.9	65.0
Interest expense	(2.4)	(2.6)	(1.7)
Interest income	0.4	0.4	0.3
Foreign currency transaction (losses) gains, net	(0.5)	0.5	2.2
Income before income taxes	43.2	27.2	65.8
Provision for income taxes	(17.0)	(9.5)	(18.5)
Net income	$ 26.2	$ 17.7	$ 47.3
Basic net income per common share	$ 2.30	$ 1.64	$ 4.53
Diluted net income per common share	$ 2.23	$ 1.55	$ 4.35
Basic weighted-average shares	11.4	10.8	10.5
Diluted weighted-average shares	11.7	11.4	10.9
Dividend declared and paid per common share	$ 0.17	$ 0.00	$ 0.00