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Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Share-Based Compensation

The following table presents share-based compensation expense:

		For the Three Months Ended March 31,
		2023		2024
Share-based compensation expense		$14.7		$21.1
Tax benefit		1.7		2.3

Schedule of Company Restricted Stock Units Transactions

The following table summarizes transactions in the Company’s restricted stock units:

		Restricted Stock Units		Weighted Average Grant Date Value
Unvested units—December 31, 2023		0.9		$138.51
Units granted		0.2		158.51
Units vested		(0.3)		129.42
Units forfeited		(0.0)		147.04
Performance condition changes		0.0		157.42
Unvested units—March 31, 2024		0.8		147.14

Schedule of Company Stock Option Transactions

The following table summarizes transactions in the Company’s stock options:

		Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)
Unexercised options outstanding—December 31, 2023		3.2		$76.74
Options granted		—		—
Options exercised		(0.0)		86.65
Options forfeited		—		—
Options expired		(0.0)		152.36
Performance condition changes		0.0		129.17
Unexercised options outstanding—March 31, 2024		3.2		76.77		2.5
Exercisable at March 31, 2024		0.0		123.38		2.7

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Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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Tabular disclosure of the changes in outstanding nonvested shares.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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