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Stock-based Compensation and Other Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Fair Value Measurement Inputs and Valuation Techniques

The fair value of each RSU is based on the grant-date fair market value of the awards. The fair value of the Company's RSUs, other than the TSR components thereof, were determined on the grant date based on the closing market price for the Company's stock. The fair values of the TSR components of the awards were $11.21, $6.41, and $8.71 per share for the 2024, 2023 and 2022 awards, respectively, determined on the grant date using a Monte Carlo simulation model based on the following assumptions:

						2024						2023						2022
Expected term (years)						3.0						3.0						3.0
Dividend yield						—						—						—
Volatility factor						32.9		%				36.0		%				43.9		%
Risk-free interest rate						4.3		%				3.7		%				1.8		%

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

A summary of the Company’s RSU activity is presented below (in millions, except fair value per unit): 

						Performance/Market and Service Conditions						Service Conditions						Total						Weighted-Average Grant-Date Fair Value Per Unit
December 31, 2023						0.6						0.6						1.2									$	92.34
Granted						0.2						0.2						0.4									98.03
Vested						(0.2)						(0.3)						(0.5)									95.29
Forfeited						(0.1)						—						(0.1)									90.21
December 31, 2024						0.5						0.5						1.0									93.66
Expected to vest						0.5						0.5						1.0									93.68

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The fair values of the options granted under the ESPP were estimated using the Black-Scholes valuation model at the date of grant based on the following assumptions:

						Year Ended December 31,
						2024						2023						2022
Expected term (years)						0.5						0.5						0.5
Dividend yield						—						—						—
Expected volatility						27.3 - 29.8%						38.1 - 38.7%						27.8 - 32.4%
Weighted-average risk-free interest rate						5.1 - 5.3%						3.8 - 4.7%						0.1 - 1.0%
Average Black-Scholes valuation per share						$	21.27					$	23.01					$	27.60
Shares issued (millions)						0.2						0.3						0.2
Stock-based compensation expense (millions)						$	4.8					$	6.1					$	6.2

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Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.

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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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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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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