Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Net Sales	$ 896.0	$ 870.7	$ 877.4	$ 849.0	$ 873.6		$ 861.8		$ 847.1		$ 812.3		$ 3,493.1	$ 3,394.8		$ 3,297.6
Gross profit	408.0	395.6	408.0	379.0	397.4		385.8		373.1		355.5		1,590.6	1,511.8		1,452.9
Income from Operations	173.4	196.0	175.3	179.5	169.2		190.6		142.3		172.1		724.2	674.2		$ 641.2
Net Income	$ 110.4	$ 124.0	$ 111.6	$ 113.0	$ 109.1	[1]	$ 120.4	[1]	$ 73.7	[1]	$ 107.2	[1]	$ 459.0	$ 410.4	[1]
Net Income per share - Basic, Reported	$ 0.43	$ 0.48	$ 0.43	$ 0.44	$ 0.42	[1],[2]	$ 0.46	[1],[2]	$ 0.28	[1],[2]	$ 0.41	[1],[2]	$ 1.78	$ 1.57	[1],[2]	$ 1.53
Net Income per share - Diluted, Reported	$ 0.42	$ 0.47	$ 0.43	$ 0.43	$ 0.41	[1],[2]	$ 0.45	[1],[2]	$ 0.28	[1],[2]	$ 0.40	[1],[2]	$ 1.75	$ 1.54	[1],[2]	$ 1.51

[1] The second quarter of 2015 Net Income includes a $17.0 or $0.06 per share impairment charge to write-off the remaining investment in Natronx.

[2] The second quarter of 2015 Income from Operations includes an $8.9 pre-tax charge or $0.03 per share to terminate an international defined benefit pension plan.