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v3.8.0.1

Results by Quarter (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 2,341.0 |  | $ 1,902.6 |  | $ 1,884.9 |  | $ 1,753.9 |  | $ 2,264.5 |  | $ 1,922.2 |  | $ 1,917.9 |  | $ 1,742.0 |  | $ 7,882.4 | $ 7,846.6 | $ 7,613.8
Salaries and related expenses | 1,325.8 | [1] | 1,227.6 | [1] | 1,239.3 | [1] | 1,275.4 | [1] | 1,308.8 | [1] | 1,228.0 | [1] | 1,229.5 | [1] | 1,268.8 | [1] | 5,068.1 | 5,035.1 | 4,854.8
Office and general expenses | 496.9 |  | 455.9 |  | 439.1 |  | 448.8 |  | 470.0 |  | 486.2 |  | 464.1 |  | 450.2 |  | 1,840.7 | 1,870.5 | 1,884.2
Operating income | 518.3 |  | 219.1 |  | 206.5 |  | 29.7 |  | 485.7 |  | 208.0 |  | 224.3 |  | 23.0 |  | 973.6 | 941.0 | 874.8
Other income (expense), net | (1.7) | [1],[2] | (9.9) | [1],[2] | (15.4) | [1],[2] | 0.8 | [1],[2] | (26.8) | [1],[2] | 5.3 | [1],[2] | 0.4 | [1],[2] | (19.2) | [1],[2] | (26.2) | (40.3) | (49.6)
Total (expenses) and other income | (19.5) |  | (26.8) |  | (36.4) |  | (14.9) |  | (44.6) |  | (11.7) |  | (18.5) |  | (36.0) |  | (97.6) | (110.8) | (112.6)
(Benefit of) provision for income taxes | 166.1 | [3] | 42.5 | [3] | 75.4 | [3] | (2.1) | [3] | 106.1 | [3] | 63.8 | [3] | 43.7 | [3] | (15.6) | [3] | 281.9 | 198.0 | 282.8
Net income | 333.5 |  | 148.8 |  | 94.6 |  | 18.1 |  | 336.9 |  | 132.7 |  | 160.2 |  | 2.7 |  | $ 595.0 | $ 632.5 | $ 480.5
Net income available to IPG common stockholders | $ 316.6 |  | $ 146.2 |  | $ 94.7 |  | $ 21.5 |  | $ 317.6 |  | $ 128.6 |  | $ 156.9 |  | $ 5.4 |  |  |  |
Basic earnings per share | $ 0.82 |  | $ 0.38 |  | $ 0.24 |  | $ 0.05 |  | $ 0.81 |  | $ 0.32 |  | $ 0.39 |  | $ 0.01 |  | $ 1.49 | $ 1.53 | $ 1.11
Diluted earnings per share | 0.81 |  | 0.37 |  | 0.24 |  | 0.05 |  | 0.78 |  | 0.32 |  | 0.38 |  | 0.01 |  | 1.46 | 1.49 | 1.09
Dividends declared per common share | $ 0.18 |  | $ 0.18 |  | $ 0.18 |  | $ 0.18 |  | $ 0.15 |  | $ 0.15 |  | $ 0.15 |  | $ 0.15 |  | $ 0.72 | $ 0.60 | $ 0.48
Pre-tax losses on sales of businesses |  |  | $ 8.7 |  | $ 13.1 |  |  |  | $ 25.3 |  |  |  |  |  | $ 16.3 |  |  |  |
Foreign tax credits |  |  | $ 31.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net impact of the Tax Act |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36.0 | $ 0.0 | $ 0.0
Tax benefit (reversal of valuation allowance) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.2 |
Tax benefit (conclusion and settlement of a tax examination of previous years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.4 |
Tax benefit (refunds to be claimed on future amended U.S. federal tax returns) |  |  |  |  |  |  |  |  | $ 37.4 |  |  |  |  |  |  |  |  |  |
[1] | As part of the adoption of FASB ASU 2017-07, we have reclassified a portion of postretirement costs from salaries and related expenses to other income (expense), net.
[2] | The three months ended June 30 and September 30, 2017 included pre-tax net losses of $13.1 and $8.7, respectively, on sales of businesses. The three months ended March 31 and December 31, 2016 included pre-tax net losses of $16.3 and $25.3, respectively, on sales of businesses.
[3] | The three months ended September 30, 2017 included a tax benefit of $31.2 related to foreign tax credits from distributions of unremitted earnings, which was reversed during the three months ended December 31, 2017 as a result of the enactment of the Tax Cuts and Jobs Act. The three months ended December 31, 2017 included a net tax benefit of $36.0 as a result of the enactment of the Tax Cuts and Jobs Act. The three months ended March 31, 2016 included a tax benefit of $12.2 due to the reversal of valuation allowances. The three months ended June 30, 2016 included a tax benefit of $23.4 related to the conclusion and settlement of a tax examination of previous years. The three months ended December 31, 2016 included a tax benefit of $37.4 for refunds to be claimed on future amended U.S. federal returns.

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