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Commitments and Contingencies (Notes) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Commitments and Contingencies | Commitments and Contingencies Leases We lease office premises and equipment. Where leases contain escalation clauses or concessions, such as rent holidays and landlord/tenant incentives or allowances, the impact of such adjustments is recognized on a straight-line basis over the minimum lease period. Certain leases provide for renewal options and require the payment of real estate taxes or other occupancy costs, which are also subject to escalation clauses. Net rent expense is listed in the table below.
| Years ended December 31,
| 2017 |  | 2016 |  | 2015
Gross rent expense | $ | 371.0 |  |  | $ | 366.1 |  |  | $ | 336.5 |
Third-party sublease rental income | (4.6 | ) |  | (4.1 | ) |  | (5.5 | )
Net rent expense | $ | 366.4 |  |  | $ | 362.0 |  |  | $ | 331.0 |
Cash amounts for future minimum lease commitments for office premises and equipment under non-cancelable leases, along with minimum sublease rental income to be received under non-cancelable subleases, are listed in the table below.
Period | Rent Obligations |  | Sublease Rental Income |  | Net Rent
2018 | $ | 335.0 |  |  | $ | (4.2 | ) |  | $ | 330.8 |
2019 | 312.1 |  |  | (3.8 | ) |  | 308.3 |
2020 | 285.3 |  |  | (2.5 | ) |  | 282.8 |
2021 | 251.4 |  |  | (1.4 | ) |  | 250.0 |
2022 | 204.1 |  |  | (0.8 | ) |  | 203.3 |
Thereafter | 727.2 |  |  | (0.5 | ) |  | 726.7 |
Total | $ | 2,115.1 |  |  | $ | (13.2 | ) |  | $ | 2,101.9 |
Guarantees We have guaranteed certain obligations of our subsidiaries relating principally to operating leases and uncommitted lines of credit of certain subsidiaries. The amount of parent company guarantees on lease obligations was $829.2 and $857.3 as of December 31, 2017 and 2016, respectively, and the amount of parent company guarantees primarily relating to uncommitted lines of credit was $491.0 and $395.6 as of December 31, 2017 and 2016, respectively. In the event of non-payment by the applicable subsidiary of the obligations covered by a guarantee, we would be obligated to pay the amounts covered by that guarantee. As of December 31, 2017, there were no material assets pledged as security for such parent company guarantees. Contingent Acquisition Obligations The following table details the estimated future contingent acquisition obligations payable in cash as of December 31, 2017.
|  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total
Deferred acquisition payments |  | $ | 41.9 |  |  | $ | 27.5 |  |  | $ | 16.1 |  |  | $ | 24.4 |  |  | $ | 4.8 |  |  | $ | 6.3 |  |  | $ | 121.0 |
Redeemable noncontrolling interests and call options with affiliates 1 |  | 37.1 |  |  | 26.4 |  |  | 62.9 |  |  | 10.3 |  |  | 6.6 |  |  | 4.1 |  |  | 147.4 |
Total contingent acquisition payments |  | $ | 79.0 |  |  | $ | 53.9 |  |  | $ | 79.0 |  |  | $ | 34.7 |  |  | $ | 11.4 |  |  | $ | 10.4 |  |  | $ | 268.4 |
1 | We have entered into certain acquisitions that contain both redeemable noncontrolling interests and call options with similar terms and conditions. The estimated amounts listed would be paid in the event of exercise at the earliest exercise date. We have certain redeemable noncontrolling interests that are exercisable at the discretion of the noncontrolling equity owners as of December 31, 2017. These estimated payments of $24.8 are included within the total payments expected to be made in 2018, and will continue to be carried forward into 2019 or beyond until exercised or expired. Redeemable noncontrolling interests are included in the table at current exercise price payable in cash, not at applicable redemption value, in accordance with the authoritative guidance for classification and measurement of redeemable securities.
The majority of these payments are contingent upon achieving projected operating performance targets and satisfying other conditions specified in the related agreements and are subject to revision in accordance with the terms of the respective agreements. See Note 4 for further information relating to the payment structure of our acquisitions. Legal Matters In the normal course of business, we are involved in various legal proceedings, and subject to investigations, inspections, audits, inquiries and similar actions by governmental authorities. The types of allegations that arise in connection with such legal proceedings vary in nature, but can include claims related to contract, employment, tax and intellectual property matters. We evaluate all cases each reporting period and record liabilities for losses from legal proceedings when we determine that it is probable that the outcome in a legal proceeding will be unfavorable and the amount, or potential range, of loss can be reasonably estimated. In certain cases, we cannot reasonably estimate the potential loss because, for example, the litigation is in its early stages. While any outcome related to litigation or such governmental proceedings in which we are involved cannot be predicted with certainty, management believes that the outcome of these matters, individually and in the aggregate, will not have a material adverse effect on our financial condition, results of operations or cash flows. As previously disclosed, on April 10, 2015, a federal judge in Brazil authorized the search of the records of an agency's offices in São Paulo and Brasilia, in connection with an ongoing investigation by Brazilian authorities involving payments potentially connected to local government contracts. The Company had previously investigated the matter and taken a number of remedial and disciplinary actions. The Company is in the process of concluding a settlement related to these matters with government agencies. The Company confirmed that one of its standalone domestic agencies has been contacted by the Department of Justice Antitrust Division for documents regarding video production practices and is cooperating with the government.

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