Acquisitions Cash Paid for Current and Prior Years' Acquisitions (Tables)

12 Months Ended

Dec. 31, 2023

Business Combinations [Abstract]

Cash Paid For Current And Prior Years' Acquisitions [Table Text Block]

Details of cash paid for current and prior years' acquisitions are listed below.

	Years ended December 31,
	2023		2022		2021
Cost of investment: current-year acquisitions	$	5.8	$	235.4	$	—
Cost of investment: prior-year acquisitions	16.6		9.3		28.0
Less: net cash acquired	3.2		3.2		—
Total cost of investment	19.2		241.5		28.0
Operating payments 1	2.7		9.6		39.1
Total cash paid for acquisitions 2	$	21.9	$	251.1	$	67.1

1Represents cash payments for amounts that have been recognized in operating expenses since the date of acquisition either relating to adjustments to estimates in excess of the initial value of contingent payments recorded or were contingent upon the future employment of the former owners of the acquired companies. Amounts are reflected in the operating section of the Consolidated Statements of Cash Flows.

2Of the total cash paid for acquisitions, $6.3, $232.2 and $0.0 for the years ended December 31, 2023, 2022 and 2021, respectively, are classified under the investing section of the Consolidated Statements of Cash Flows as acquisitions, net of cash acquired. These amounts relate to initial payments for new transactions, as well as adjustments made to upfront payments related to prior year acquisitions. Of the total cash paid for acquisitions, $12.9, $9.3 and $28.0 for the years ended December 31, 2023, 2022 and 2021, respectively, are classified under the financing section of the Consolidated Statements of Cash Flows as acquisition-related payments. These amounts relate to deferred payments and increases in our ownership interest for prior acquisitions.

Redeemable Noncontrolling Interest

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

	Years ended December 31,
	2023		2022		2021
Balance at beginning of period	$	38.3	$	15.6	$	93.1
Change in related non-controlling interests balance	(0.3)		(0.5)		2.2
Changes in redemption value of redeemable non-controlling interests:
Additions	7.4		30.3		0.0
Redemptions and other	(0.4)		(9.9)		(41.9)
Redemption value adjustments	(2.6)		3.0		(32.1)
Currency translation adjustments	(0.1)		(0.2)		(5.7)
Balance at end of period	$	42.3	$	38.3	$	15.6