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STOCK-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense

Stock-based compensation expense related to awards issued under the Company's incentive compensation plans for the three and nine months ended September 30, 2019 and 2018 was as follows (in millions):
 
Three Months Ended   
September 30,
 
Nine Months Ended   
September 30,
 
2019
 
2018
 
2019
 
2018
Cost of sales
$
3.6

 
$
2.7

 
$
11.5

 
$
8.5

Selling, general, and administrative expenses
12.4

 
11.9

 
39.4

 
36.4

Research and development expenses
3.8

 
2.8

 
12.0

 
10.1

Total stock-based compensation expense
$
19.8

 
$
17.4

 
$
62.9

 
$
55.0


Schedule of Weighted-Average Assumptions for Options Granted
The following table includes the weighted-average grant-date fair values of stock options granted during the periods indicated and the related weighted-average assumptions used in the Black-Scholes option pricing model:
 Option Awards
Three Months Ended   
September 30,
 
Nine Months Ended   
September 30,
 
2019
 
2018
 
2019
 
2018
Average risk-free interest rate
1.8
%
 
2.8
%
 
2.3
%
 
2.9
%
Expected dividend yield
None

 
None

 
None

 
None

Expected volatility
29.7
%
 
29.2
%
 
29.6
%
 
29.1
%
Expected term (years)
5.2

 
5.2

 
5.1

 
5.0

Fair value, per option
$
58.07

 
$
46.37

 
$
54.31

 
$
42.44


Schedule of Weighted-Average Assumptions for ESPP Subscriptions Granted
The following table includes the weighted-average grant-date fair values for ESPP subscriptions granted during the periods indicated and the related weighted-average assumptions used in the Black-Scholes option pricing model:
 ESPP
Three Months Ended   
September 30,
 
Nine Months Ended   
September 30,
 
2019
 
2018
 
2019
 
2018
Average risk-free interest rate
2.0
%
 
2.2
%
 
2.4
%
 
1.7
%
Expected dividend yield
None

 
None

 
None

 
None

Expected volatility
32.0
%
 
34.3
%
 
32.4
%
 
32.8
%
Expected term (years)
0.7

 
0.7

 
0.6

 
0.6

Fair value, per share
$
57.31

 
$
46.58

 
$
49.29

 
$
36.53