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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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 |
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 |
(1) Reflects our redemption of a portion of the redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB and includes $1.1 million, $0.8 million, and $0.2 million representing the difference between the redemption value and the carrying value of the acquired interest as of December 31, 2017, 2016, and 2015, respectively.
Changes in allowance for uncollectible receivables | The following table details the changes in the allowance for uncollectible receivables.
($ in millions) | 2017 | 2016 | 2015
Allowance as of January 1, | $ | 37.1 |  | 23.2 |  | 17.9 |
Charged to income | 26.3 |  | 21.3 |  | 14.5 |
Write-off of uncollectible receivables | (14.2 | ) | (7.6 | ) | (8.7 | )
Reserves acquired from acquisitions | — |  | 0.3 |  | 0.3 |
Impact of exchange rate movements and other | 2.1 |  | (0.1 | ) | (0.8 | )
Allowance as of December 31, | $ | 51.3 |  | 37.1 |  | 23.2 |
Net property and equipment | The following table shows the gross value of major asset categories and the standard depreciable lives, as of December 31, 2017, for each of these asset categories.
| December 31, |
($ in millions) | 2017 | 2016 | Depreciable Life
Furniture, fixtures and equipment | $ | 96.7 |  | 100.8 |  | 3 to 13 years
Computer equipment and software | 635.1 |  | 589.9 |  | 2.5 to 10 years
Leasehold improvements | 260.6 |  | 239.2 |  | 1 to 10 years
Other (1) | 66.4 |  | 59.1 |  | 2 to 30 years
Total | 1,058.8 |  | 989.0 |  |
Less: Accumulated depreciation | 514.9 |  | 488.0 |  |
Net property and equipment | $ | 543.9 |  | 501.0 |  |
(1) Other includes certain assets, such as land, which are not depreciated.

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity. + References No definition available. + Details
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