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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of Components of Stock-Based Compensation Expense

The following table summarizes the expenses and associated income tax benefits recognized (in millions):

			Year Ended December 31,
			2022						2021						2020
Compensation expense			$	27.1					$	23.3					$	16.4
Income tax benefit			(7.1)						(6.0)						(4.2)
Total			$	20.0					$	17.3					$	12.2

Summary of Stock Option Activity

A summary of option activity is presented below.

			Options						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term (Years)						Aggregate Intrinsic Value (in millions of dollars)
Outstanding at December 31, 2021			96,728						$	43.48
Granted			—						—
Exercised			(5,661)						33.19
Forfeited or expired			—						—
Outstanding at December 31, 2022			91,067						$	44.12
Expected to Vest at December 31, 2022			—						$	—					—						$	—
Exercisable at December 31, 2022			91,067						$	44.12					1.3						$	8.0

Schedule of Stock Options by Exercise Price Range

Stock options as of December 31, 2022:

			Options Outstanding																		Options Exercisable
Range of Exercise Prices			Number Outstanding						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term (Years)						Number Outstanding						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term (Years)
$30.01-40.00			55,653						$	33.19					0.6						55,653						$	33.19					0.6
50.01-60.00			27,529						58.78						2.4						27,529						58.78						2.4
70.01-80.00			7,885						70.14						2.1						7,885						70.14						2.1
			91,067						$	44.12											91,067						$	44.12

Schedule of Additional Information Pertaining to Option Activity

Additional information pertaining to stock option activity is as follows (in millions):

			Year Ended December 31,
			2022						2021						2020
Aggregate intrinsic value of stock options exercised			$	0.5					$	4.6					$	3.7
Cash received from the exercise of stock options			0.2						2.2						5.6
Tax benefit realized on exercise of stock options			0.1						1.2						1.0

Summary of PSU Activity

A summary of the PSU activity is presented below.

			Units						Weighted Average Grant Date Fair Value
Nonvested at December 31, 2021			400,218						$	48.30
Granted			50,620						164.43
Vested			(120,871)						40.79
Performance change			(7,715)						40.79
Forfeited			(3,267)						54.54
Nonvested at December 31, 2022			318,985						$	69.68

Summary of RSU Activity

A summary of the RSU activity is presented below.

			Units						Weighted Average Grant Date Fair Value
Nonvested at December 31, 2021			353,910						$	54.22
Granted			79,122						155.68
Vested			(175,654)						49.03
Forfeited			(9,779)						87.25
Nonvested at December 31, 2022			247,599						$	89.18

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Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options.

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-Topic 718
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-Section 50
-Paragraph 2A
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