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Selected Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
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)
202020192020201920202019
First Quarter$723.8 $790.3 $165.7 $201.6 $12.9 $69.3 
Second Quarter$941.3 $1,099.1 $275.7 $332.1 $100.0 $110.7 
Third Quarter$1,055.0 $1,032.9 $323.3 $298.3 $131.7 $114.7 
Fourth Quarter$914.0 $885.0 $275.3 $247.8 $111.7 $114.0 

Basic Earnings
per Share (2)
Diluted Earnings
per Share (2)
Cash Dividends per Common Share
202020192020201920202019
First Quarter$0.34 $1.75 $0.33 $1.73 $0.77 $0.64 
Second Quarter$2.62 $2.83 $2.60 $2.80 $0.77 $0.77 
Third Quarter$3.44 $2.97 $3.42 $2.94 $0.77 $0.77 
Fourth Quarter$2.92 $2.96 $2.89 $2.93 $0.77 $0.77 

(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.