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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
Changes in amounts attributable to 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, 2016
$
6.8

Acquisition of redeemable noncontrolling interest (1)
(3.5
)
Net loss
(0.1
)
Impact of exchange rate movements
0.6

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


(1) Reflects our redemption of a portion of the redeemable noncontrolling interest related to our Tenzing AB acquisition and includes $2.3 million, and $1.1 million representing the difference between the redemption value and the carrying value of the acquired interest in 2018 and 2017, respectively.
(2) Reflects the ownership interests retained by the seller associated with our 2019 acquisition of Latitude Real Estate Investors. See Note 4, Business Combinations, Goodwill and Other Intangibles, for additional discussion.
Financing Receivable, Allowance for Credit Loss [Table Text Block]
The following table details the changes in the allowance for uncollectible receivables.
($ in millions)
2019
2018
2017
Allowance as of January 1,
$
52.0

51.3

37.1

Charged to income
30.8

18.8

26.3

Write-off of uncollectible receivables
(13.8
)
(13.9
)
(14.2
)
Impact of exchange rate movements and other
(0.9
)
(4.2
)
2.1

Allowance as of December 31,
$
68.1

52.0

51.3
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, 2019, for each of these asset categories.
 
December 31,
 
($ in millions)
2019
2018
Depreciable Life
Furniture, fixtures and equipment
$
115.4

98.7

3 to 13 years
Computer equipment and software
752.9

683.6

2 to 10 years
Leasehold improvements
308.6

274.0

1 to 10 years
Other (1)
185.7

99.9

2 to 30 years
Total
1,362.6

1,156.2

 
Less: Accumulated depreciation
660.7

588.3

 
Net property and equipment
$
701.9

567.9

 

(1) Other includes certain assets, such as land, which are not depreciated.
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] .