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Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Share-Based Compensation

The following table presents share-based compensation expense:

			For the Three Months Ended June 30,												For the Six Months Ended June 30,
			2022						2023						2022						2023
Share-based compensation			$	15.1					$	14.7					$	29.8					$	29.4
Tax benefit			1.9						1.9						3.7						3.7

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, 2022			1.1						$	106.88
Units granted			0.3						159.91
Units vested			(0.4)						87.22
Units forfeited			(0.0		)				129.13
Performance condition changes			0.0						73.81
Unvested units–June 30, 2023			1.0						131.67

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, 2022			3.2						$	76.81
Options granted			—						—
Options exercised			(0.0		)				127.77
Options forfeited			—						—
Options expired			—						—
Performance condition changes			—						—
Unexercised options outstanding–June 30, 2023			3.2						76.74						3.2
Exercisable at June 30, 2023			0.0						121.51						3.2

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 Six Months Ended June 30,
						2022
Dividend yield						0.0		%
Expected volatility						36.8		%
Risk-free interest rate						1.7		%
Expected life of options (in years)						5.7
Forfeiture rate						—		%

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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 the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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