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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock, Shares | Common Stock, Amount | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss, Net of Tax | Treasury Stock | Total IPG Stockholders' Equity | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Common Stock, shares |  | 386.2 |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 2,246.3 |  | $ 38.6 | $ 955.2 | $ 2,104.5 | $ (827.8) | $ (59.0) | $ 2,211.5 | $ 34.8
Net income | 295.2 |  |  |  |  |  |  |  |
Net income available to IPG common stockholders | 292.7 |  |  |  | 292.7 |  |  | 292.7 |
Net income attributable to noncontrolling interest | 2.5 |  |  |  |  |  |  |  | 2.5
Other comprehensive loss | (99.8) |  |  |  |  | (97.5) |  | (97.5) |
Other comprehensive loss, attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (2.3)
Reclassifications related to redeemable noncontrolling interests | (7.1) |  |  |  |  |  |  |  | (7.1)
Distributions to noncontrolling interests | (13.4) |  |  |  |  |  |  |  | 13.4
Change in redemption value of redeemable noncontrolling interests | 46.3 |  |  | 41.8 | 4.5 |  |  | 46.3 |
Repurchases of common stock | (117.1) |  |  |  |  |  | 117.1 | 117.1 |
Common stock dividends ($0.235 and $0.210 per share, respectively) | (241.6) |  |  |  | (241.6) |  |  | (241.6) |
Stock-based compensation, shares |  | 4.7 |  |  |  |  |  |  |
Stock-based compensation, value | 63.8 |  | 0.5 | 63.3 |  |  |  | 63.8 |
Exercise of stock options, shares |  | 1.4 |  |  |  |  |  |  |
Exercise of stock options, value | 9.2 |  | 0.1 | 9.1 |  |  |  | 9.2 |
Shares withheld for taxes, shares |  | (1.2) |  |  |  |  |  |  |
Shares withheld for taxes, value | (29.0) |  | 0.1 | 28.9 |  |  |  | 29.0 |
Other | (3.2) |  |  | (1.3) | 1.7 |  |  | 0.4 | (3.6)
Balance at Sep. 30, 2018 | 2,170.2 |  | 39.1 | 1,041.8 | 2,158.4 | (925.3) | (176.1) | 2,137.9 | 32.3
Common Stock, shares |  | 390.5 |  |  |  |  |  |  |
Balance at Jun. 30, 2018 | 2,091.6 |  | 39.0 | 1,022.9 | 2,076.7 | (903.4) | (173.5) | 2,061.7 | 29.9
Net income | 163.5 |  |  |  |  |  |  |  |
Net income available to IPG common stockholders | 161.0 |  |  |  | 161.0 |  |  | 161.0 |
Net income attributable to noncontrolling interest | 2.5 |  |  |  |  |  |  |  | 2.5
Other comprehensive loss | (22.4) |  |  |  |  | (21.9) |  | (21.9) |
Other comprehensive loss, attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (0.5)
Reclassifications related to redeemable noncontrolling interests | 0.8 |  |  |  |  |  |  |  | (0.8)
Distributions to noncontrolling interests | (2.8) |  |  |  |  |  |  |  | 2.8
Change in redemption value of redeemable noncontrolling interests | 1.6 |  |  |  | 1.6 |  |  | 1.6 |
Repurchases of common stock | (2.6) |  |  |  |  |  | 2.6 | 2.6 |
Common stock dividends ($0.235 and $0.210 per share, respectively) | (80.4) |  |  |  | (80.4) |  |  | (80.4) |
Stock-based compensation, shares |  | 0.1 |  |  |  |  |  |  |
Stock-based compensation, value | 15.3 |  | 0.0 | 15.3 |  |  |  | 15.3 |
Exercise of stock options, shares |  | 0.5 |  |  |  |  |  |  |
Exercise of stock options, value | 2.2 |  | 0.1 | 2.1 |  |  |  | 2.2 |
Shares withheld for taxes, shares |  | 0.0 |  |  |  |  |  |  |
Shares withheld for taxes, value | (0.4) |  | (0.0) | 0.4 |  |  |  | 0.4 |
Other | (3.8) |  |  | (1.9) | 0.5 |  |  | (1.4) | (2.4)
Balance at Sep. 30, 2018 | 2,170.2 |  | 39.1 | 1,041.8 | 2,158.4 | (925.3) | $ (176.1) | 2,137.9 | 32.3
Common Stock, shares |  | 391.1 |  |  |  |  |  |  |
Common Stock, shares |  | 383.6 |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | 2,432.8 |  | 38.3 | 895.9 | 2,400.1 | (941.1) |  | 2,393.2 | 39.6
Cumulative effect of accounting change | 2.2 |  |  |  | 2.2 |  |  | 2.2 |
Net income | 331.7 |  |  |  |  |  |  |  |
Net income available to IPG common stockholders | 327.1 |  |  |  | 327.1 |  |  | 327.1 |
Net income attributable to noncontrolling interest | 4.6 |  |  |  |  |  |  |  | 4.6
Other comprehensive loss | (26.3) |  |  |  |  | (25.1) |  | (25.1) |
Other comprehensive loss, attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (1.2)
Reclassifications related to redeemable noncontrolling interests | (2.0) |  |  |  |  |  |  |  | (2.0)
Distributions to noncontrolling interests | (12.4) |  |  |  |  |  |  |  | 12.4
Change in redemption value of redeemable noncontrolling interests | 1.4 |  |  |  | 1.4 |  |  | 1.4 |
Common stock dividends ($0.235 and $0.210 per share, respectively) | (272.2) |  |  |  | (272.2) |  |  | (272.2) |
Stock-based compensation, shares |  | 3.7 |  |  |  |  |  |  |
Stock-based compensation, value | 64.7 |  | 0.4 | 64.3 |  |  |  | 64.7 |
Exercise of stock options, shares |  | 0.6 |  |  |  |  |  |  |
Exercise of stock options, value | 4.3 |  | 0.1 | 4.2 |  |  |  | 4.3 |
Shares withheld for taxes, shares |  | (1.0) |  |  |  |  |  |  |
Shares withheld for taxes, value | (22.5) |  | 0.1 | 22.4 |  |  |  | 22.5 |
Other | 2.6 |  |  | 1.0 | 3.1 |  |  | 4.1 | (1.5)
Balance at Sep. 30, 2019 | 2,503.1 |  | 38.7 | 941.0 | 2,455.5 | (966.2) |  | 2,469.0 | 34.1
Common Stock, shares |  | 386.4 |  |  |  |  |  |  |
Balance at Jun. 30, 2019 | 2,458.4 |  | 38.6 | 921.4 | 2,381.8 | (917.9) |  | 2,423.9 | 34.5
Net income | 168.4 |  |  |  |  |  |  |  |
Net income available to IPG common stockholders | 165.6 |  |  |  | 165.6 |  |  | 165.6 |
Net income attributable to noncontrolling interest | 2.8 |  |  |  |  |  |  |  | 2.8
Other comprehensive loss | (49.7) |  |  |  |  | (48.3) |  | (48.3) |
Other comprehensive loss, attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (1.4)
Reclassifications related to redeemable noncontrolling interests | (2.4) |  |  |  |  |  |  |  | (2.4)
Distributions to noncontrolling interests | (4.3) |  |  |  |  |  |  |  | 4.3
Change in redemption value of redeemable noncontrolling interests | 0.0 |  |  |  | 0.0 |  |  | 0.0 |
Common stock dividends ($0.235 and $0.210 per share, respectively) | (90.8) |  |  |  | (90.8) |  |  | (90.8) |
Stock-based compensation, shares |  | 0.1 |  |  |  |  |  |  |
Stock-based compensation, value | 16.2 |  | 0.0 | 16.2 |  |  |  | 16.2 |
Exercise of stock options, shares |  | 0.5 |  |  |  |  |  |  |
Exercise of stock options, value | 3.7 |  | 0.1 | 3.6 |  |  |  | 3.7 |
Shares withheld for taxes, shares |  | (0.1) |  |  |  |  |  |  |
Shares withheld for taxes, value | (0.2) |  | (0.0) | 0.2 |  |  |  | 0.2 |
Other | 1.0 |  |  | (0.0) | 1.1 |  |  | 1.1 | (0.1)
Balance at Sep. 30, 2019 | $ 2,503.1 |  | $ 38.7 | $ 941.0 | $ 2,455.5 | $ (966.2) |  | $ 2,469.0 | $ 34.1
Common Stock, shares |  | 386.9 |  |  |  |  |  |  |

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