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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2014
$
13.4

Acquisition of redeemable noncontrolling interest (1)
(2.8
)
Net income
1.6

Impact of exchange rate movements
(1.1
)
Redeemable noncontrolling interests as of December 31, 2015
$
11.1

Acquisition of redeemable noncontrolling interest (1)
(3.6
)
Net income
0.1

Impact of exchange rate movements
(0.8
)
Redeemable noncontrolling interests as of December 31, 2016
$
6.8


(1) Reflects our redemption of a portion of the redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB and includes $0.8 million and $0.2 million representing the difference between the redemption value and the carrying value of the acquired interest as of December 31, 2016 and 2015, respectively.
Changes in allowance for uncollectible receivables
The following table details the changes in the allowance for uncollectible receivables.
($ in millions)
2016
2015
2014
Allowance as of January 1,
$
23.2

17.9

18.8

Charged to income
21.3

14.5

8.2

Write-off of uncollectible receivables
(7.6
)
(8.7
)
(7.8
)
Reserves acquired from acquisitions
0.3

0.3

0.9

Impact of exchange rate movements and other
(0.1
)
(0.8
)
(2.2
)
Allowance as of December 31,
$
37.1

23.2

17.9
Net property and equipment
The following table shows the gross value of major asset categories and the standard depreciable lives for each of these asset categories.
 
December 31,
 
($ in millions)
2016
2015
Depreciable Life
Furniture, fixtures and equipment
$
100.8

82.8

3 to 10 years
Computer equipment and software
589.9

510.6

2.5 to 7 years
Leasehold improvements
239.2

209.3

1 to 12 years
Automobiles and other
59.1

69.8

4 to 30 years
Total
989.0

872.5

 
Less: Accumulated depreciation
488.0

449.2

 
Net property and equipment
$
501.0

423.3