Quarterly Operating Results (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,369.1	$ 1,517.8	$ 1,532.2	$ 1,447.6	$ 1,357.8	$ 1,200.5	$ 1,208.6	$ 1,098.0	$ 5,866.7		$ 4,864.9		$ 4,385.2
Gross profit	127.6	156.4	174.6	167.0	146.4	125.3	144.7	137.6	625.6		554.0		519.5
Net income (loss) attributable to Company common shareholders	4.4	3.6	37.5	38.2	35.0	18.1	23.8	(7.8)	83.8	[1]	69.2	[1]	56.3	[1]
Net income (loss) attributable to Company common shareholders — for diluted EPS computation	$ 4.5	$ 3.7	$ 37.6	$ 38.3	$ 35.1	$ 18.2	$ 23.9	$ (7.7)	$ 84.1	[1]	$ 69.5	[1]	$ 56.6	[1]
Earnings (loss) per common share — basic	$ 0.09	$ 0.07	$ 0.72	$ 0.73	$ 0.67	$ 0.35	$ 0.46	$ (0.15)	$ 1.61	[2]	$ 1.33	[2]	$ 1.08	[2]
Earnings (loss) per common share — assuming dilution	$ 0.09	$ 0.07	$ 0.68	$ 0.70	$ 0.66	$ 0.34	$ 0.45	$ (0.15)	$ 1.57		$ 1.31		$ 1.07

[1] Numerator

[2] Under the two class method, Earnings per share — basic reflects undistributed earnings per share for both common stock and unvested share-based payment awards (restricted stock).