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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Stock-based compensation  
Schedule of Compensation Expense Stock-based compensation expense is primarily included in selling and administrative expenses in the Condensed Consolidated Statements of Earnings and is as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
 
2017
 
2016
 
2017
 
2016
Total pre-tax stock-based compensation
 
$
4.7

 
$
3.9

 
$
10.7

 
$
8.6
Schedule of Stock-based Payment Award Grants The Company awarded the following stock-based compensation grants:
 
 
Six Months Ended June 30, 2017
Stock options
 
364,675

Restricted stock
 
65,637

Performance shares
 
47,285

Restricted stock units
 
12,952
Schedule of weighted-average assumptions for stock options The weighted-average assumptions used in the determination of fair value for stock option awards in 2017 and 2016 were as follows:  
 
 
2017
 
2016
Expected dividend yield
 
1.3
%
 
1.4
%
Expected life in years
 
5.58

 
5.61

Expected volatility
 
25.6
%
 
27.5
%
Risk-free interest rate
 
1.9
%
 
1.4
%
Weighted-average fair value per share
 
$
24.57

 
$
19.30
Stock options  
Stock-based compensation  
Schedule of Compensation Expense Stock-based compensation expense related to stock options were as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
 
2017
 
2016
 
2017
 
2016
Pre-tax stock-based compensation
 
$
1.9

 
$
1.4

 
3.8

 
3.0