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Stock Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation Expense
The following table provides information regarding the Company’s stock-based compensation expense:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Stock-based compensation
$
27.1

 
$
23.7

 
$
81.1

 
$
67.6

Tax effect recognized in net earnings
5.7

 
8.3

 
17.0

 
23.7

Weighted Average Assumptions Used to Value Option Grants
The following weighted average assumptions were used to estimate the fair value of options granted during current and prior year periods using the Black-Scholes option-pricing model:
 
Nine months ended September 30,
 
2018
 
2017
Risk-free interest rate (%)
2.63
 
2.03
Expected option life (years)
5.32
 
5.26
Expected volatility (%)
18.04
 
18.76
Expected dividend yield (%)
0.59
 
0.67