Quarterly Summary and Statistical Information (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 776.7		$ 771.3		$ 802.8		$ 709.9		$ 797.8		$ 776.6		$ 826.7		$ 754.4		$ 3,060.7	$ 3,155.5	$ 3,211.9
Gross Profit	299.8		282.4		300.9		259.0		258.3		282.2		301.4		272.5		1,142.1	1,114.4	1,112.9
Net income (loss)	29.7		77.0		90.3		59.1		(184.3)		82.1		75.4		66.8		256.1	40.0	219.7
Basic earnings per share:
Net income (loss) (in dollars per share)	$ 0.39	[1]	$ 1.00	[1]	$ 1.18	[1]	$ 0.78	[1]	$ (2.44)	[1]	$ 1.09	[1]	$ 1.01	[1]	$ 0.90	[1]	$ 3.35	$ 0.53	$ 2.99
Diluted earnings per share:
Net income (loss) (in dollars per share)	$ 0.38	[1]	$ 0.99	[1]	$ 1.16	[1]	$ 0.77	[1]	$ (2.44)	[1]	$ 1.07	[1]	$ 0.98	[1]	$ 0.87	[1]	$ 3.30	$ 0.52	$ 2.91
Market price of common stock:
High (in dollars per share)	$ 101.72	[2]	$ 89.80	[2]	$ 85.43	[2]	$ 79.14	[2]	$ 68.86	[2]	$ 61.58	[2]	$ 61.08	[2]	$ 58.89	[2]
Low (in dollars per share)	$ 85.06	[2]	$ 74.46	[2]	$ 72.00	[2]	$ 68.23	[2]	$ 58.40	[2]	$ 48.14	[2]	$ 47.40	[2]	$ 45.39	[2]
Close (in dollars per share)	$ 98.87	[2]	$ 87.40	[2]	$ 84.04	[2]	$ 77.51	[2]	$ 67.23	[2]	$ 59.08	[2]	$ 50.45	[2]	$ 57.80	[2]
Scenario, Adjustment [Member]
Quarterly Financial Information Disclosure [Abstract]
Gross Profit			2.3		2.4		4.8		42.0		2.6		2.7		4.6		6.7	(51.9)	(48.4)
Net income (loss)			$ 7.6		$ 7.5		$ 6.2		$ 72.7		$ 6.6		$ 6.1		$ 5.9		$ 66.6	$ (54.1)	$ (49.7)
Basic earnings per share:
Net income (loss) (in dollars per share)			$ 0.10		$ 0.10		$ 0.08		$ 0.96		$ 0.09		$ 0.08		$ 0.08		$ 0.87	$ (0.72)	$ (0.68)
Diluted earnings per share:
Net income (loss) (in dollars per share)			$ 0.10		$ 0.10		$ 0.08		$ 0.96		$ 0.09		$ 0.08		$ 0.08		$ 0.86	$ (0.71)	$ (0.66)

[1] Per share results for the four quarters may differ from full-year per share results, as a separate computation of the weighted average number of shares outstanding is made for each quarter presented.

[2] Principal market: New York Stock Exchange.