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Share-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Employee Stock Purchase Plan
Following is information regarding our 2009 ESPP:
Year Ended December 31,
202320222021
Cash received related to ESPP purchases ($ in millions)
$29.3 $34.4 $29.6 
Tax deductions associated with ESPP disqualifying dispositions ($ in millions)
$3.9 $3.1 $1.9 
Weighted average per share discount for compensation expense recognized
$41.58 $38.57 $50.58 
Schedule of Restricted Stock Units Activity
RSU grants vest over a period of time up to four years from the date of grant. RSU activity was as follows:
RSUs
Weighted average per share grant date fair value
Balance, December 31, 2022415,878 $159.85 
Granted327,955 302.35 
Vested (182,056)174.61 
Forfeited(32,101)214.41 
Balance, December 31, 2023529,676 287.04 
Schedule of Assumptions in Valuation of RSUs
The assumptions for the valuation of time-vesting RSUs and performance and time-vesting RSUs granted are summarized as follows:
Year Ended December 31,
202320222021
Time-vesting RSUs
Number of shares granted
48,872 18,080 33,665 
Grant date fair value per share
$268.60 $283.86 $312.83 
Weighted-average assumptions/inputs:
Expected dividend yield
0.6 %0.5 %0.4 %
Range of risk-free interest rates
3.6% - 4.7%
1.2% - 4.5%
0.3% - 1.0%
Performance and Time-vesting RSUs
Number of shares granted
279,083 120,340 94,001 
Grant date fair value per share
$313.84 $296.28 $308.59 
Weighted-average assumptions/inputs:
Expected dividend yield
0.6 %0.5 %0.4 %
Range of risk-free interest rates
3.6% - 4.5%
0.4% - 3.2%
0.3% -0.7%
Summary of Certain Information Regarding RSU Grant Vesting
Certain information regarding RSU grant vesting was as follows:
Year Ended December 31,
($ in millions)
202320222021
Number of shares vested
182,056147,441141,857
Weighted average per share fair value of non-vested shares that vested during the period
$174.61 $110.77 $107.50 
Tax deduction realized related to shares that vested during the period ($ in millions)
$25.8 $20.3 $26.3 
Schedule of Stock-Based Compensation
Share-based compensation is recognized as a component of SG&A in our Consolidated Statements of Operations. SG&A expense related to all share-based compensation is as follows:
Year Ended December 31,
($ in millions)
202320222021
Restricted stock unit awards
$35.6 $35.0 $29.5 
Employee stock purchase plan
5.2 6.1 5.2 
Total share-based compensation
40.841.134.7
Tax expense recognized
(7.6)(6.4)(8.1)
Net reduction in net income
$33.2 $34.7 $26.6