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Revenue Income Statement (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 2,413.7 | $ 1,895.7 | $ 1,948.2 | $ 1,774.0 | $ 2,131.1 | $ 1,832.5 | $ 1,834.6 | $ 1,675.3 | $ 8,031.6 | $ 7,473.5 | $ 7,452.3
Billable expenses | 442.3 | 401.8 | 443.6 | 395.1 | 458.7 | 375.7 | 351.2 | 388.5 | 1,682.8 | 1,574.1 | 1,603.9
Total revenue | 2,856.0 | 2,297.5 | 2,391.8 | 2,169.1 | 2,589.8 | 2,208.2 | 2,185.8 | 2,063.8 | 9,714.4 | 9,047.6 | 9,056.2
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |
Salaries and related expenses | 1,423.7 | 1,251.4 | 1,292.9 | 1,330.3 | 1,291.3 | 1,218.8 | 1,228.9 | 1,251.7 | 5,298.3 | 4,990.7 | 4,942.2
Office and other direct expenses | 381.0 | 317.0 | 333.3 | 323.8 | 334.8 | 302.9 | 318.4 | 312.7 | 1,355.1 | 1,268.8 | 1,274.9
Billable expense | 442.3 | 401.8 | 443.6 | 395.1 | 458.7 | 375.7 | 351.2 | 388.5 | 1,682.8 | 1,574.1 | 1,603.9
Cost of services | 2,247.0 | 1,970.2 | 2,069.8 | 2,049.2 | 2,084.8 | 1,897.4 | 1,898.5 | 1,952.9 | 8,336.2 | 7,833.6 | 7,821.0
Selling, General and Administrative Expense | 81.0 | 21.6 | 28.8 | 35.1 | 49.4 | 13.6 | 20.3 | 35.2 | 166.5 | 118.5 | 138.6
Depreciation and amortization | 68.9 | 44.0 | 44.0 | 46.0 | 32.6 | 42.2 | 41.3 | 41.0 | 202.9 | 157.1 | 160.2
Total operating expenses | 2,396.9 | 2,035.8 | 2,142.6 | 2,130.3 | 2,166.8 | 1,953.2 | 1,960.1 | 2,029.1 | 8,705.6 | 8,109.2 | 8,119.8
Operating Income (Loss) | 459.1 | 261.7 | 249.2 | 38.8 | 423.0 | 255.0 | 225.7 | 34.7 | 1,008.8 | 938.4 | 936.4
EXPENSES AND OTHER INCOME: |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  | (123.0) | (90.8) | (90.6)
Interest income |  |  |  |  |  |  |  |  | 21.8 | 19.4 | 20.1
Other expense, net | (13.6) | (15.3) | (16.3) | (24.4) | (1.7) | (9.9) | (15.4) | 0.8 | (69.6) | (26.2) | (40.3)
Total (expenses) and other income | (55.2) | (37.6) | (37.7) | (40.3) | (19.5) | (26.8) | (36.4) | (14.9) | (170.8) | (97.6) | (110.8)
Income before income taxes |  |  |  |  |  |  |  |  | 838.0 | 840.8 | 825.6
Provision for income taxes | 62.2 | 60.7 | 63.6 | 12.7 | 135.1 | 54.9 | 81.6 | (0.3) | 199.2 | 271.3 | 196.9
Income of consolidated companies |  |  |  |  |  |  |  |  | 638.8 | 569.5 | 628.7
Equity in net (loss) income of unconsolidated affiliates |  |  |  |  |  |  |  |  | (1.1) | 0.9 | 0.3
NET INCOME | $ 342.5 | $ 163.5 | $ 147.8 | $ (16.1) | $ 269.2 | $ 172.3 | $ 107.6 | $ 21.3 | 637.7 | 570.4 | 629.0
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (18.8) | (16.0) | (24.0)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  | $ 618.9 | $ 554.4 | $ 605.0
Earnings per share, Basic | $ 0.85 | $ 0.42 | $ 0.38 | $ (0.04) | $ 0.66 | $ 0.44 | $ 0.27 | $ 0.06 | $ 1.61 | $ 1.42 | $ 1.52
Earnings per share, Diluted | $ 0.84 | $ 0.41 | $ 0.37 | $ (0.04) | $ 0.64 | $ 0.43 | $ 0.27 | $ 0.06 | $ 1.59 | $ 1.40 | $ 1.48
Weighted-average number of common shares outstanding, Basic |  |  |  |  |  |  |  |  | 383.3 | 389.6 | 397.9
Weighted-average number of common shares outstanding, Diluted |  |  |  |  |  |  |  |  | 389.0 | 397.3 | 408.0
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | $ 7,508.7 | $ 7,456.9
Billable expenses |  |  |  |  |  |  |  |  |  | 373.7 | 389.7
Total revenue |  |  |  |  |  |  |  |  |  | 7,882.4 | 7,846.6
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |
Salaries and related expenses |  |  |  |  |  |  |  |  |  | 4,990.7 | 4,942.2
Office and other direct expenses |  |  |  |  |  |  |  |  |  | 1,268.8 | 1,274.9
Billable expense |  |  |  |  |  |  |  |  |  | 373.7 | 389.7
Cost of services |  |  |  |  |  |  |  |  |  | 6,633.2 | 6,606.8
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  | 118.5 | 138.6
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 157.1 | 160.2
Total operating expenses |  |  |  |  |  |  |  |  |  | 6,908.8 | 6,905.6
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 973.6 | 941.0
EXPENSES AND OTHER INCOME: |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  | (90.8) | (90.6)
Interest income |  |  |  |  |  |  |  |  |  | 19.4 | 20.1
Other expense, net |  |  |  |  |  |  |  |  |  | (26.2) | (40.3)
Total (expenses) and other income |  |  |  |  |  |  |  |  |  | (97.6) | (110.8)
Income before income taxes |  |  |  |  |  |  |  |  |  | 876.0 | 830.2
Provision for income taxes |  |  |  |  |  |  |  |  |  | 281.9 | 198.0
Income of consolidated companies |  |  |  |  |  |  |  |  |  | 594.1 | 632.2
Equity in net (loss) income of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.9 | 0.3
NET INCOME |  |  |  |  |  |  |  |  |  | 595.0 | 632.5
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (16.0) | (24.0)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  | $ 579.0 | $ 608.5
Earnings per share, Basic |  |  |  |  |  |  |  |  |  | $ 1.49 | $ 1.53
Earnings per share, Diluted |  |  |  |  |  |  |  |  |  | $ 1.46 | $ 1.49
Weighted-average number of common shares outstanding, Basic |  |  |  |  |  |  |  |  |  | 389.6 | 397.9
Weighted-average number of common shares outstanding, Diluted |  |  |  |  |  |  |  |  |  | 397.3 | 408.0
ASC 606 Adjustments [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | $ (35.2) | $ (4.6)
Billable expenses |  |  |  |  |  |  |  |  |  | 1,200.4 | 1,214.2
Total revenue |  |  |  |  |  |  |  |  |  | 1,165.2 | 1,209.6
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |
Salaries and related expenses |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Office and other direct expenses |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Billable expense |  |  |  |  |  |  |  |  |  | 1,200.4 | 1,214.2
Cost of services |  |  |  |  |  |  |  |  |  | 1,200.4 | 1,214.2
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Total operating expenses |  |  |  |  |  |  |  |  |  | 1,200.4 | 1,214.2
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | (35.2) | (4.6)
EXPENSES AND OTHER INCOME: |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Interest income |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Other expense, net |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Total (expenses) and other income |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Income before income taxes |  |  |  |  |  |  |  |  |  | (35.2) | (4.6)
Provision for income taxes |  |  |  |  |  |  |  |  |  | (10.6) | (1.1)
Income of consolidated companies |  |  |  |  |  |  |  |  |  | (24.6) | (3.5)
Equity in net (loss) income of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
NET INCOME |  |  |  |  |  |  |  |  |  | (24.6) | (3.5)
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  | $ (24.6) | $ (3.5)
Earnings per share, Basic |  |  |  |  |  |  |  |  |  | $ (0.07) | $ (0.01)
Earnings per share, Diluted |  |  |  |  |  |  |  |  |  | $ (0.06) | $ (0.01)
Weighted-average number of common shares outstanding, Basic |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Weighted-average number of common shares outstanding, Diluted |  |  |  |  |  |  |  |  |  | 0.0 | 0.0

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