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

12 Months Ended

Jan. 01, 2020

Dec. 31, 2020

Accounting Policies [Abstract]

Redeemable Noncontrolling Interest [Table Text Block]

Changes in amounts attributable to redeemable noncontrolling interests are presented in the following table.

(in millions)
Redeemable noncontrolling interests as of December 31, 2017			$	3.8
Acquisition of redeemable noncontrolling interest (1)			(3.8)
Redeemable noncontrolling interests as of December 31, 2018			—
Business acquisition (2)			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 of December 31, 2020			$	7.8

(1) Reflects our redemption of a portion of the redeemable noncontrolling interest related to our Tenzing AB acquisition and includes $2.3 million, representing the difference between the redemption value and the carrying value of the acquired interest in 2018.

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

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)			2020			2019			2018
Revenue excluded from scope of ASC Topic 606			$	305.3		204.6			135.8

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

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

(in millions)			2020			2019			2018
Allowance as of January 1,(1)			$	71.7		52.0			51.3
Charged to income			24.3			30.8			18.8
Write-off of uncollectible receivables			(29.5)			(13.8)			(13.9)
Impact of exchange rate movements and other			—			(0.9)			(4.2)
Allowance as of December 31,			$	66.5		68.1			52.0

(1) January 1, 2020 includes $3.6 million adjustment due to adoption of ASC Topic 326. Refer to the "New Accounting Standards" section below for further detail.

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, 2020, for each of these asset categories.

			December 31,
($ in millions)			2020			2019			Depreciable Life
Furniture, fixtures and equipment			$	127.9		115.4			3 to 13 years
Computer equipment and software			829.8			752.9			3 to 10 years
Leasehold improvements			352.4			308.6			1 to 10 years
Other (1)			160.0			185.7			2 to 30 years
Total			1,470.1			1,362.6
Less: Accumulated depreciation			806.2			660.7
Net property and equipment			$	663.9		701.9

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

Accounting Standards Update and Change in Accounting Principle

The following table details the cumulative impact to Retained earnings upon adoption of ASC Topic 326.

			Published			Adjustment due to						Reported Under ASC Topic 326
(in millions)			December 31, 2019			adoption of ASC Topic 326						on January 1, 2020
Assets
Allowance for trade receivables			$	(68.1)		(3.6)						$	(71.7)
Deferred tax assets, net			245.4			5.5						250.9
Allowance for contract assets (1)			—			(1.7)						(1.7)
Liabilities and equity
Loan loss guarantee reserve (2)			$	—		15.1						$	15.1
Retained earnings			3,588.3			(14.9)						3,573.4

(1) The portion of the allowance for long-term contract assets is included within Other assets on the Consolidated Balance Sheets.

(2) Included within Other liabilities on the Consolidated Balance Sheets

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

Detail of our contract assets and liabilities is presented below.

(in millions)			December 31, 2020			December 31, 2019
Contract assets, gross			$	347.8		419.3
Allowance for contract assets			(2.1)			n/a
Contract assets, net			$	345.7		419.3
Contract liabilities			$	111.0		87.7

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