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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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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