Selected Quarterly Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of information on net sales, gross profit, net income, earnings per share and dividends per share

The following tables provide information on Net sales, Gross profit, Net income, Earnings per share and Cash dividends declared per share by quarter (in millions, except per share data):



	Net Sales ⁽¹⁾				Gross Profit ⁽¹⁾				Net Income ⁽¹⁾
	2017		2016		2017		2016		2017		2016
First Quarter	$	793.4	$	715.2	$	210.9	$	183.6	$	43.5	$	24.9
Second Quarter	1,102.1		1,019.2		340.8		315.0		115.5		110.7
Third Quarter	1,052.3		1,010.0		313.7		310.3		103.5		101.7
Fourth Quarter	891.8		897.3		259.8		267.6		43.1		40.4



	Basic Earnings per Share ⁽²⁾				Diluted Earnings per Share ⁽²⁾				Cash Dividends per Common Share
	2017		2016		2017		2016		2017		2016
First Quarter	$	1.02	$	0.57	$	1.00	$	0.56	$	0.43	$	0.36
Second Quarter	2.73		2.54		2.69		2.51		0.51		0.43
Third Quarter	2.47		2.35		2.44		2.33		0.51		0.43
Fourth Quarter	1.03		0.94		1.02		0.93		0.51		0.43

⁽¹⁾ The sum of the quarterly results for each of the four quarters may not equal the full year results due to rounding.

⁽²⁾ EPS for each quarter is computed using the weighted-average number of shares outstanding during that quarter, while EPS for the fiscal year is computed using the weighted-average number of shares outstanding during the year. Thus, the sum of the EPS for each of the four quarters may not equal the EPS for the fiscal year.