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Segment Information Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segments: |  |  |  |
Revenue | $ 1,902.6 | $ 1,922.2 | $ 5,541.4 | $ 5,582.1
Segment operating income (loss): | 219.1 | 208.0 | 455.3 | 455.3
Interest expense | (21.0) | (21.7) | (67.6) | (68.8)
Interest income | 4.1 | 4.7 | 14.0 | 16.1
Other (expense) income, net | (9.9) | 5.3 | (24.5) | (13.5)
Income before income taxes | 192.3 | 196.3 | 377.2 | 389.1
Depreciation and amortization of fixed assets and intangible assets | 42.2 | 39.7 | 124.5 | 117.5
Capital expenditures | 39.8 | 51.5 | 108.7 | 114.5
IAN |  |  |  |
Segments: |  |  |  |
Revenue | 1,520.2 | 1,503.2 | 4,465.6 | 4,453.3
Segment operating income (loss): | 183.9 | 184.1 | 402.1 | 424.1
Depreciation and amortization of fixed assets and intangible assets | 30.7 | 29.1 | 90.8 | 85.9
Capital expenditures | 29.3 | 39.7 | 77.9 | 86.9
CMG |  |  |  |
Segments: |  |  |  |
Revenue | 382.4 | 419.0 | 1,075.8 | 1,128.8
Segment operating income (loss): | 50.1 | 54.8 | 127.4 | 125.2
Depreciation and amortization of fixed assets and intangible assets | 4.6 | 4.9 | 15.2 | 14.6
Capital expenditures | 6.2 | 4.7 | 12.9 | 8.4
Corporate and Other |  |  |  |
Segments: |  |  |  |
Segment operating income (loss): | (14.9) | (30.9) | (74.2) | (94.0)
Depreciation and amortization of fixed assets and intangible assets | 6.9 | 5.7 | 18.5 | 17.0
Capital expenditures | $ 4.3 | $ 7.1 | $ 17.9 | $ 19.2

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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