Service Revenue (Tables)

12 Months Ended

May 31, 2026

Revenue from Contract with Customer [Abstract]

Summary of PEO Pass-Through Costs Netted in Revenue

PEO pass-through costs netted within the PEO and Insurance Solutions revenue are as follows:


		Year ended May 31,
In millions		2026					2025					2024
Payroll wages and payroll taxes		$		32,197.0			$		29,280.0			$		27,381.5
State unemployment insurance (included in payroll wages and payroll taxes)		$		179.4			$		167.4			$		151.8
Guaranteed cost benefit plans		$		752.3			$		681.6			$		660.3

Summary of Changes in Deferred Revenue Related to Material Rights Performance Obligations

Changes in deferred revenue related to material rights that exceed one year were as follows:


		Year ended May 31,
In millions		2026					2025
Balance, beginning of period		$		92.4			$		74.9
Deferred revenue acquired				—					19.0
Deferral of revenue				54.1					39.0
Recognition of unearned revenue				(55.1	)				(40.5	)
Balance, end of period		$		91.4			$		92.4

Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts

Changes in deferred costs to obtain and fulfill contracts were as follows:


Costs to fulfill contracts:
		Year ended May 31,
In millions		2026					2025
Balance, beginning of period		$		87.0			$		76.6
Capitalization of costs				83.0					37.8
Amortization				(34.1	)				(27.4	)
Balance, end of period		$		135.9			$		87.0


Costs to obtain contracts:
		Year ended May 31,
In millions		2026					2025
Balance, beginning of period		$		609.0			$		609.4
Capitalization of costs				259.5					208.7
Amortization				(215.1	)				(209.1	)
Balance, end of period		$		653.4			$		609.0