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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Employee Stock Purchase Plan

Following is information regarding our ESPP:

			Year Ended December 31,
			2024						2023						2022
Cash received related to ESPP purchases ($ in millions)			$	27.1					$	29.3					$	34.4
Tax deductions associated with ESPP disqualifying dispositions ($ in millions)			$	3.5					$	3.9					$	3.1
Weighted average per share discount for compensation expense recognized			$	44.75					$	41.58					$	38.57

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, 2023			529,676						$	159.85
Granted			313,386						338.00
Vested			(113,077)						234.48
Forfeited			(46,801)						292.82
Balance, December 31, 2024			683,184						317.66

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,
			2024						2023						2022
Time-vesting RSUs
Number of shares granted			44,773						48,872						18,080
Grant date fair value per share			$	305.78					$	268.60					$	283.86
Weighted-average assumptions/inputs:
Expected dividend yield			0.6		%				0.6		%				0.5		%
Range of risk-free interest rates			3.8% - 4.8%						3.6% - 4.7%						1.2% - 4.5%
Performance and Time-vesting RSUs
Number of shares granted			268,764						279,083						120,340
Grant date fair value per share			$	350.38					$	313.84					$	296.28
Weighted-average assumptions/inputs:
Expected dividend yield			0.6		%				0.6		%				0.5		%
Range of risk-free interest rates			3.9% - 4.8%						3.6% - 4.5%						0.4% -3.2%

Summary of Certain Information Regarding RSU Grant Vesting

Certain information regarding RSU grant vesting was as follows:

			Year Ended December 31,
($ in millions)			2024						2023						2022
Number of shares vested			113,077						182,056						147,441
Weighted average per share fair value of non-vested shares that vested during the period			$	234.48					$	174.61					$	110.77
Tax deduction realized related to shares that vested during the period ($ in millions)			$	21.9					$	25.8					$	20.3

Schedule of Stock-Based Compensation

SG&A expense related to all share-based compensation is as follows:

			Year Ended December 31,
($ in millions)			2024						2023						2022
Restricted stock unit awards			$	53.6					$	35.6					$	35.0
Employee stock purchase plan			4.8						5.2						6.1
Total share-based compensation			58.4						40.8						41.1
Tax expense			(6.0)						(7.6)						(6.4)
Net expense recognized			$	52.4					$	33.2					$	34.7

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Schedule Of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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