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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-Based Compensation
The following table presents share-based compensation expense:
For the Three Months Ended September 30,For the Nine Months Ended September 30,
2020202120202021
Share-based compensation $15.7 $21.2 $46.4 $44.5 
Tax benefit2.9 3.5 8.4 7.8 
Schedule of Company Restricted Stock Units Transactions
The following table summarizes transactions in the Company’s restricted stock units:
Restricted Stock UnitsWeighted Average Grant Date Value
Unvested units - December 31, 20201.2 $99.46 
Units granted0.2 139.71 
Units vested(0.3)130.58 
Units forfeited(0.1)105.45 
Performance condition changes0.1 80.19 
Unvested units - September 30, 20211.1 94.22 
Schedule of Company Stock Option Transactions
The following table summarizes transactions in the Company’s stock options:
Stock OptionsWeighted Average
Exercise Price
Weighted Average
Remaining
Contractual Life
(Years)
Unexercised options outstanding - December 31, 20202.9 $82.14  
Options granted0.0 150.68 
Options exercised(0.2)120.12 
Options forfeited(0.0 )154.44  
Performance condition changes0.6 74.42 
Unexercised options outstanding - September 30, 20213.3 78.21 4.8
Exercisable at September 30, 20210.2 131.74 1.6
Schedule of Fair Value of Options Granted and Assumptions The weighted average grant date assumptions used to estimate the fair value of stock options granted were as follows:
For the Nine Months Ended September 30,
20202021
Dividend yield1.6 %0.0 %
Expected volatility30.4 %37.1 %
Risk-free interest rate0.9 %1.0 %
Expected life of options (in years)5.75.7
Forfeiture rate— %— %