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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Redeemable Noncontrolling Interest [Table Text Block]

Changes in amounts attributable to non-redeemable noncontrolling interests are reflected in the Consolidated Statements of Changes in Equity. Changes in amounts attributable to redeemable noncontrolling interests are presented in the following table.

(in millions)
Redeemable noncontrolling interests as of December 31, 2020			$	7.8
Net loss			(0.1)
Other			0.1
Redeemable noncontrolling interests as of December 31, 2021			7.8
Net loss			(0.3)
Distribution to redeemable noncontrolling interest			(0.2)
Other			(0.3)
Redeemable noncontrolling interests as December 31, 2022			7.0
Net loss			(0.2)
Redemption of redeemable noncontrolling interest(1)			(6.8)
Redeemable noncontrolling interests as of December 31, 2023			$	—

(1) Reflects redemption of the redeemable noncontrolling interest related to our 2019 acquisition of Latitude Real Estate Investors and includes $4.0 million and $2.8 million, representing the approximate fair value and the difference between the fair value and carrying value, respectively.

Disaggregation of Revenue

			Year Ended December 31,
(in millions)			2023			2022			2021
Revenue excluded from scope of ASC Topic 606			$	286.3		293.6			337.1

Contract with Customer, Contract Asset, Contract Liability, and Receivable

Such contract assets and liabilities are presented below.

(in millions)			December 31, 2023			December 31, 2022
Contract assets, gross			$	402.3		447.0
Contract asset allowance			(1.8)			(2.3)
Contract assets, net			$	400.5		444.7
Contract liabilities			$	166.2		151.4

Financing Receivable, Allowance for Credit Loss [Table Text Block]

The following table details the changes in the allowance for uncollectible receivables.

(in millions)			2023			2022			2021
Allowance as of January 1,			$	66.7		67.6			66.5
Charged to income			22.0			25.0			25.5
Write-off of uncollectible receivables			(15.8)			(23.2)			(22.1)
Impact of exchange rate movements and other			(2.2)			(2.7)			(2.3)
Allowance as of December 31,			$	70.7		66.7			67.6

Property, Plant and Equipment [Table Text Block]

The following table shows the gross value of major asset categories and the standard depreciable lives, as of December 31, 2023, for each of these asset categories.

			December 31,
($ in millions)			2023			2022			Depreciable Life
Furniture, fixtures and equipment			$	145.4		138.7			3 to 13 years
Computer equipment and software			987.9			932.2			2 to 7 years
Leasehold improvements			468.2			431.2			1 to 15 years
Other (1)			51.5			41.3			2 to 30 years
Total			1,653.0			1,543.4
Less: Accumulated depreciation			1,039.1			960.5
Net property and equipment			$	613.9		582.9

(1) Other includes certain assets, such as land, which are not depreciated.

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Tabular disclosure of allowance for credit loss on financing receivable.

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Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

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Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity.

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