Quarterly Financial Information (unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Summary of information on net sales, gross profit, net income, earnings per share and dividends per share
Net Sales	$ 684.9	$ 809.7	$ 840.4	$ 614.4	$ 648.5	$ 801.2	$ 808.6	$ 582.6	$ 2,949.4	[1]	$ 2,840.9	[1]	$ 2,585.2	[1]
Gross Profit	168.4	204.9	208.1	140.9	153.4	186.6	199.0	130.9	722.3		669.9		701.2
Net income	$ 21.9	$ 29.4	$ 44.7	$ (6.1)	$ 16.7	$ 33.8	$ 45.0	$ (7.2)	$ 90.0		$ 88.3		$ 116.2
Basic Earnings (Loss) per Share	$ 0.44	$ 0.58	$ 0.88	$ (0.12)	$ 0.32	$ 0.65	$ 0.85	$ (0.13)	$ 1.77		$ 1.68		$ 2.13
Diluted Earnings (Loss) per Share	$ 0.43	$ 0.57	$ 0.87	$ (0.12)	$ 0.32	$ 0.64	$ 0.83	$ (0.13)	$ 1.75		$ 1.65		$ 2.08
Dividends per Common Share	$ 0.2	$ 0.2	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.76		$ 0.72		$ 0.60

[1] On a consolidated basis, no revenues from transactions with a single customer were 10% or greater of our consolidated net sales for any of the periods presented.