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Results by Quarter (Unaudited) (Notes) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information | Results by Quarter (Unaudited)
| Three Months Ended March 31, |  | Three Months Ended June 30, |  | Three Months Ended September 30, |  | Three Months Ended December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Revenue | $ | 1,753.9 |  |  | $ | 1,742.0 |  |  | $ | 1,884.9 |  |  | $ | 1,917.9 |  |  | $ | 1,902.6 |  |  | $ | 1,922.2 |  |  | $ | 2,341.0 |  |  | $ | 2,264.5 |
Salaries and related expenses 1 | 1,275.4 |  |  | 1,268.8 |  |  | 1,239.3 |  |  | 1,229.5 |  |  | 1,227.6 |  |  | 1,228.0 |  |  | 1,325.8 |  |  | 1,308.8 |
Office and general expenses | 448.8 |  |  | 450.2 |  |  | 439.1 |  |  | 464.1 |  |  | 455.9 |  |  | 486.2 |  |  | 496.9 |  |  | 470.0 |
Operating income | 29.7 |  |  | 23.0 |  |  | 206.5 |  |  | 224.3 |  |  | 219.1 |  |  | 208.0 |  |  | 518.3 |  |  | 485.7 |
Other income (expense), net 1,2 | 0.8 |  |  | (19.2 | ) |  | (15.4 | ) |  | 0.4 |  |  | (9.9 | ) |  | 5.3 |  |  | (1.7 | ) |  | (26.8 | )
Total (expenses) and other income | (14.9 | ) |  | (36.0 | ) |  | (36.4 | ) |  | (18.5 | ) |  | (26.8 | ) |  | (11.7 | ) |  | (19.5 | ) |  | (44.6 | )
(Benefit of) provision for income taxes 3 | (2.1 | ) |  | (15.6 | ) |  | 75.4 |  |  | 43.7 |  |  | 42.5 |  |  | 63.8 |  |  | 166.1 |  |  | 106.1 |
Net income | 18.1 |  |  | 2.7 |  |  | 94.6 |  |  | 160.2 |  |  | 148.8 |  |  | 132.7 |  |  | 333.5 |  |  | 336.9 |
Net income available to IPG common stockholders | $ | 21.5 |  |  | $ | 5.4 |  |  | $ | 94.7 |  |  | $ | 156.9 |  |  | $ | 146.2 |  |  | $ | 128.6 |  |  | $ | 316.6 |  |  | $ | 317.6 |
Earnings per share available to IPG common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.05 |  |  | $ | 0.01 |  |  | $ | 0.24 |  |  | $ | 0.39 |  |  | $ | 0.38 |  |  | $ | 0.32 |  |  | $ | 0.82 |  |  | $ | 0.81 |
Diluted | $ | 0.05 |  |  | $ | 0.01 |  |  | $ | 0.24 |  |  | $ | 0.38 |  |  | $ | 0.37 |  |  | $ | 0.32 |  |  | $ | 0.81 |  |  | $ | 0.78 |
Dividends declared per common share | $ | 0.18 |  |  | $ | 0.15 |  |  | $ | 0.18 |  |  | $ | 0.15 |  |  | $ | 0.18 |  |  | $ | 0.15 |  |  | $ | 0.18 |  |  | $ | 0.15 |
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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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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