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v3.6.0.2

Results by Quarter (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Salaries and related expenses |  | 1,309.4 |  | 1,228.8 |  | 1,229.0 |  | 1,270.9 |  | 1,235.1 |  | 1,202.2 |  | 1,205.2 |  | 1,215.2 |  | 5,038.1 | 4,857.7 | 4,820.4
Office and general expenses |  | 470.0 |  | 486.2 |  | 464.1 |  | 450.2 |  | 504.7 |  | 471.4 |  | 455.1 |  | 453.0 |  | 1,870.5 | 1,884.2 | 1,928.3
Operating income |  | 485.1 |  | 207.2 |  | 224.8 |  | 20.9 |  | 456.4 |  | 191.9 |  | 215.8 |  | 7.8 |  | (938.0) | (871.9) | (788.4)
Other (expense) income, 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
Total (expenses) and other income |  | (44.0) | [1] | (10.9) | [1] | (19.0) | [1] | (33.9) | [1] | (28.6) | [1] | (52.9) | [1] | (14.8) | [1] | (13.4) | [1] | 107.8 | 109.7 | 67.7
Provision for (benefit of) income taxes |  | 106.1 | [2] | 63.8 | [2] | 43.7 | [2] | (15.6) | [2] | 145.4 | [2] | 61.1 | [2] | 77.7 | [2] | (1.4) | [2] | 198.0 | 282.8 | 216.5
Net income (loss) |  | 336.9 |  | 132.7 |  | 160.2 |  | 2.7 |  | 282.9 |  | 78.0 |  | 123.8 |  | (4.2) |  | $ (632.5) | $ (480.5) | $ (505.4)
Net (loss) income available to IPG common stockholders | [2] | $ 317.6 |  | $ 128.6 |  | $ 156.9 |  | $ 5.4 |  | $ 260.3 |  | $ 74.9 |  | $ 121.2 |  | $ (1.8) |  |  |  |
Basic earnings per share |  | $ 0.81 |  | $ 0.32 |  | $ 0.39 |  | $ 0.01 |  | $ 0.65 |  | $ 0.18 |  | $ 0.30 |  | $ 0.00 |  | $ 1.53 | $ 1.11 | $ 1.14
Diluted earnings per share |  | 0.78 |  | 0.32 |  | 0.38 |  | 0.01 |  | 0.63 |  | 0.18 |  | 0.29 |  | 0.00 |  | 1.49 | 1.09 | 1.12
Dividends declared per common share |  | $ 0.150 |  | $ 0.150 |  | $ 0.150 |  | $ 0.150 |  | $ 0.120 |  | $ 0.120 |  | $ 0.120 |  | $ 0.120 |  | $ 0.60 | $ 0.48 | $ 0.38
Pre-tax losses on sales of businesses |  | $ 25.3 |  |  |  |  |  | $ 16.3 |  | $ 12.0 |  | $ 38.0 |  |  |  |  |  |  |  |
Tax benefit (Reversal of valuation allowance) |  |  |  |  |  |  |  | 12.2 |  |  |  |  |  |  |  |  |  | $ 12.2 |  | $ 66.0
Tax benefit (Adoption of FASB ASU 2016-09) |  |  |  |  |  |  |  | $ 7.5 |  |  |  |  |  |  |  |  |  | 10.4 |  |
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 returns) |  | $ 37.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26.6 | $ 13.0 | $ 21.3
[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.
[2] | The three months ended March 31, 2016 included tax benefits of $12.2 and $7.5 due to the reversal of valuation allowances and the adoption of FASB ASU 2016-09, respectively. The three months ended June 30 and December 31, 2016 included tax benefits of $23.4 related to the conclusion and settlement of a tax examination of previous years and $37.4 for refunds to be claimed on future amended U.S. federal returns, respectively.

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