Supplementary Data (Tables)

3 Months Ended

Mar. 31, 2025

Supplementary Data [Abstract]

Accrued Liabilities

The following table presents the components of accrued liabilities.

	March 31, 2025		December 31, 2024
Salaries, benefits and related expenses	$	294.4	$	432.1
Interest	39.0		37.5
Income taxes payable	46.4		80.3
Office and related expenses	16.9		18.7
Acquisition obligations	5.3		5.3
Restructuring charges	61.0		0.4
Other	98.4		87.3
Total accrued liabilities	$	561.4	$	661.6

Other Income (Expense), Net

Results of operations for the three months ended March 31, 2025 and 2024 include certain items that are not directly associated with our revenue-producing operations.

Redeemable Noncontrolling Interest [Table Text Block]

Redeemable Non-controlling Interests

Many of our acquisitions include provisions under which the non-controlling equity owners may require us to purchase additional interests in a subsidiary at their discretion. Redeemable non-controlling interests are adjusted quarterly, if necessary, to their estimated redemption value, but not less than their initial fair value. Any adjustments to the redemption value impact retained earnings or additional paid in capital, except for foreign currency translation adjustments.

The following table presents changes in our redeemable non-controlling interests.

	Three months ended March 31,
	2025		2024
Balance at beginning of period	$	45.6	$	42.3
Change in related non-controlling interests balance	(0.6)		(0.3)
Changes in redemption value of redeemable non-controlling interests:
Additions	8.6		—
Redemptions and other	(5.1)		(6.1)
Redemption value adjustments	0.0		0.0
Currency translation adjustments	0.1		0.1
Balance at end of period	$	48.6	$	36.0