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Segment Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 2,264.5 |  | $ 1,922.2 |  | $ 1,917.9 |  | $ 1,742.0 |  | $ 2,196.2 |  | $ 1,865.5 |  | $ 1,876.1 |  | $ 1,676.0 |  | $ 7,846.6 | $ 7,613.8 | $ 7,537.1
Segment operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 938.0 | 871.9 | 788.4
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.6 | 85.8 | 84.9
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.1 | 22.8 | 27.4
Other expense, net | (26.2) | [1] | $ 6.1 | [1] | $ (0.1) | [1] | $ (17.1) | [1] | (10.3) | [1] | $ (37.2) | [1] | $ 0.5 | [1] | $ 0.3 | [1] | 37.3 | 46.7 | 10.2
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 830.2 | 762.2 | 720.7
Depreciation and amortization of fixed assets and intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160.2 | 157.0 | 163.0
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.7 | 161.1 | 148.7
Assets | 12,485.2 |  |  |  |  |  |  |  | 12,585.1 |  |  |  |  |  |  |  | 12,485.2 | 12,585.1 |
IAN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,318.9 | 6,144.9 | 6,076.3
Segment operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 895.3 | 847.4 | 774.0
Depreciation and amortization of fixed assets and intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 117.7 | 117.5 | 124.5
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 149.2 | 117.5 | 92.0
Assets | 10,660.0 |  |  |  |  |  |  |  | 10,738.2 |  |  |  |  |  |  |  | 10,660.0 | 10,738.2 |
CMG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,527.7 | 1,468.9 | 1,460.8
Segment operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 189.9 | 166.3 | 163.9
Depreciation and amortization of fixed assets and intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.5 | 18.4 | 18.5
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16.6 | 12.7 | 11.7
Assets | 1,428.3 |  |  |  |  |  |  |  | 1,338.6 |  |  |  |  |  |  |  | 1,428.3 | 1,338.6 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (147.2) | (141.8) | (149.5)
Depreciation and amortization of fixed assets and intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23.0 | 21.1 | 20.0
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34.9 | 30.9 | $ 45.0
Assets | $ 396.9 |  |  |  |  |  |  |  | $ 508.3 |  |  |  |  |  |  |  | $ 396.9 | $ 508.3 |
[1] | The three months ended March 31 and December 31, 2016 included pre-tax losses of $16.3 and $25.3, respectively, on sales of businesses. The three months ended September 30 and December 31, 2015 included pre-tax losses of $38.0 and $12.0, respectively, on sales of businesses.

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