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Contingent Acquisition Obligations (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Deferred acquisition payments |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Future contingent acquisition obligation due in 2018 | $ 41.9 |
Future contingent acquisition obligation due in 2019 | 27.5 |
Future contingent acquisition obligation due in 2020 | 16.1 |
Future contingent acquisition obligation due in 2021 | 24.4 |
Future contingent acquisition obligation due in 2022 | 4.8 |
Future contingent acquisition obligation due thereafter | 6.3 |
Future contingent acquisition obligation due, total | 121.0 |
Redeemable noncontrolling interests and call options with affiliates |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Future contingent acquisition obligation due in 2018 | 37.1 | [1]
Future contingent acquisition obligation due in 2019 | 26.4 | [1]
Future contingent acquisition obligation due in 2020 | 62.9 | [1]
Future contingent acquisition obligation due in 2021 | 10.3 | [1]
Future contingent acquisition obligation due in 2022 | 6.6 | [1]
Future contingent acquisition obligation due thereafter | 4.1 | [1]
Future contingent acquisition obligation due, total | 147.4 | [1]
Redeemable at noncontrolling equity owners discretion |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Future contingent acquisition obligation due in 2018 | 24.8 |
Total contingent acquisition payments |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Future contingent acquisition obligation due in 2018 | 79.0 |
Future contingent acquisition obligation due in 2019 | 53.9 |
Future contingent acquisition obligation due in 2020 | 79.0 |
Future contingent acquisition obligation due in 2021 | 34.7 |
Future contingent acquisition obligation due in 2022 | 11.4 |
Future contingent acquisition obligation due thereafter | 10.4 |
Future contingent acquisition obligation due, total | $ 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.

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- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25383-109308 + Details
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- Definition Amount of the recorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25383-109308 + Details
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