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

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Redeemable Noncontrolling Interest [Table Text Block]

Changes in amounts attributable 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, 2018			$	—
Business acquisition (1)			8.4
Net income			0.2
Redeemable noncontrolling interests as of December 31, 2019			8.6
Net loss			(0.3)
Distribution to redeemable noncontrolling interest			(0.5)
Redeemable noncontrolling interests as December 31, 2020			7.8
Net loss			(0.1)
Other			0.1
Redeemable noncontrolling interests as of December 31, 2021			$	7.8

(1) Reflects the ownership interests retained by the seller associated with our 2019 acquisition of Latitude Real Estate Investors.

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

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

(in millions)			2021			2020			2019
Allowance as of January 1,(1)			$	66.5		71.7			52.0
Charged to income			25.5			24.3			30.8
Write-off of uncollectible receivables			(22.1)			(29.5)			(13.8)
Impact of exchange rate movements and other			(2.3)			—			(0.9)
Allowance as of December 31,			$	67.6		66.5			68.1

(1) January 1, 2020 includes $3.6 million adjustment due to the adoption of ASC Topic 326.

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, 2021, for each of these asset categories.

			December 31,
($ in millions)			2021			2020			Depreciable Life
Furniture, fixtures and equipment			$	132.5		127.9			3 to 13 years
Computer equipment and software			886.9			829.8			2 to 7 years
Leasehold improvements			396.0			352.4			1 to 15 years
Other (1)			233.6			160.0			2 to 30 years
Total			1,649.0			1,470.1
Less: Accumulated depreciation			909.1			806.2
Net property and equipment			$	740.0		663.9

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

Disaggregation of Revenue

Such out-of-scope revenue was included entirely within Americas Capital Markets and is presented below.

			Year Ended December 31,
(in millions)			2021			2020			2019
Revenue excluded from scope of ASC Topic 606			$	337.1		305.3			204.6

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

Detail of our contract assets and liabilities is presented below.

(in millions)			December 31, 2021			December 31, 2020
Contract assets, gross			$	438.7		347.8
Allowance for contract assets			(2.8)			(2.1)
Contract assets, net			$	435.9		345.7
Contract liabilities			$	128.9		111.0

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