Unaudited Interim Financial Information (Unaudited Interim Financial Information) (Details) (USD $)	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
Unaudited Interim Financial Information (Abstract]
Net sales	$ 751,900,000		$ 719,200,000		$ 725,000,000		$ 700,300,000		$ 717,100,000		$ 678,400,000		$ 673,900,000		$ 650,800,000		$ 2,896,400,000		$ 2,720,200,000		$ 2,534,900,000
Cost of goods sold	282,100,000		274,900,000		275,500,000		264,800,000		263,700,000		251,900,000		251,700,000		252,700,000		1,097,300,000		1,020,000,000		959,000,000
Income from operations before income taxes	142,000,000		182,100,000		2,700,000		184,000,000		176,800,000		183,200,000		182,700,000		175,000,000		510,800,000		717,700,000		671,500,000
Net income attributable to common shareholders	$ 113,800,000		$ 130,100,000		$ (47,800,000)		$ 131,900,000		$ 136,200,000		$ 127,500,000		$ 124,600,000		$ 120,900,000		$ 328,000,000		$ 509,200,000		$ 460,100,000
Basic earnings per share available to common shareholders	$ 1.31	[1]	$ 1.48	[1]	$ (0.55)	[1]	$ 1.52	[1]	$ 1.48		$ 1.35		$ 1.31		$ 1.25		$ 3.75	[1]	$ 5.39		$ 4.66
Diluted earnings per share available to common shareholders	$ 1.30	[1]	$ 1.46	[1]	$ (0.55)	[1],[2]	$ 1.49	[1]	$ 1.47	[1]	$ 1.34	[1]	$ 1.29	[1]	$ 1.24	[1]	$ 3.69	[1]	$ 5.32	[1]	$ 4.60

[1] Total per share amounts may not add due to rounding.

[2] Common share equivalents primarily from share-based compensation plans were not included in the computation of diluted weighted average shares outstanding because their effect would have been antidilutive.