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Share-based Payments (Tables)

9 Months Ended

Sep. 30, 2025

Share-Based Payment Arrangement [Abstract]

Compensation Costs Related to Share-Based Payments

The following table presents the components of share-based payment expense by consolidated income statement classification:

						Three months ended September 30,												Nine months ended September 30,
						2025						2024						2025						2024
Selling, general and administrative:
Stock option compensation expense						$	0.1					$	0.7					$	0.6					$	3.0
Equity-classified share units						19.9						7.3						55.0						32.9
Liability-classified share units						0.4						0.6						1.7						2.1
Employee share purchase plan						1.4						1.2						5.7						5.8
						21.8						9.8						63.0						43.8
Acquisition-related and integration costs:
Acceleration of share-based payments expense						—						0.1						—						1.0
Share-based continuing employment costs						1.0						0.2						1.4						0.4
						1.0						0.3						1.4						1.4
						$	22.8					$	10.1					$	64.4					$	45.2

Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity

The following table presents share unit activity for the nine months ended September 30, 2025 (actual number of units; weighted-average grant-date fair value per share unit):

			Equity-classified																																				Liability-classified
			Performance Share Units (Performance Conditions)												Performance Share Units (Market Conditions)												Restricted Share Units												Deferred Share Units
			Number						WA grant date fair value						Number						WA grant date fair value						Number						WA grant date fair value						Number						WA grant date fair value
Outstanding, December 31, 2024			450,175						$	64.73					268,954						$	105.53					607,805						$	66.00					73,490						$	40.29
Granted			153,439						99.88						153,208						151.41						479,032						98.26						606						106.01
Vested and settled			(132,018)						58.74						—						—						(283,613)						63.30						(2,245)						67.40
Forfeited			(4,155)						73.41						(2,870)						125.54						(29,704)						81.11						—						—
Outstanding at September 30, 2025			467,441						$	77.88					419,292						$	122.16					773,520						$	86.39					71,851						$	40.00

Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options

fair value of PSUs with market vesting conditions was estimated using a Monte Carlo simulation model on the respective grant dates, incorporating the following significant assumptions, presented on a weighted average basis:

						Nine months ended September 30,
						2025			2024
Risk free interest rate						4.0		%	4.4		%
Expected lives of the PSUs						3 years			3 years
Expected volatility						30.4		%	32.2		%
Average expected volatility of comparable companies						34.7		%	48.3		%

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- References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 50
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/718-50/tableOfContent

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (f)(2)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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