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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Net Sales	$ 1,088.5	$ 1,132.8	$ 1,121.5	$ 1,047.7	$ 947.9	$ 1,013.1	$ 1,014.3	$ 986.7	$ 4,390.5	$ 3,962.0	$ 3,869.2
Gross Profit	531.2	555.9	558.5	518.0	471.9	499.8	501.6	491.5	2,163.6	1,964.8	1,948.9
Pre-tax Earnings	200.8	226.0	235.4	210.9	180.8	201.2	207.8	199.9	873.1	789.7	826.1
Net Earnings	$ 152.4	$ 143.1	$ 148.9	$ 134.2	$ 114.8	$ 126.9	$ 131.5	$ 126.2	$ 578.6	$ 499.4	$ 516.4
Basic Net Earnings per Share (in dollars per share)	$ 0.53	$ 0.50	$ 0.52	$ 0.46	$ 0.40	$ 0.44	$ 0.46	$ 0.44	$ 2.01	$ 1.73	$ 1.77
Diluted Net Earnings per Share (in dollars per share)	$ 0.53	$ 0.50	$ 0.52	$ 0.46	$ 0.40	$ 0.44	$ 0.45	$ 0.44	$ 2.01	$ 1.73	$ 1.77
Net earnings, absent impact of tax act	$ 128.1								$ 554.2
Basic net earnings per share, absent impact of tax act (in dollars per share)	$ 0.45								$ 1.92
Diluted net earnings per share, absent impact of tax act (in dollars per share)	$ 0.45								$ 1.92

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period, excluding the effect of the Tax Cuts and Jobs Act of 2017.

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