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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Millions, $ in Millions | Total | Redeemable non-controlling interest | Common Stock | Treasury Stock | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) Income
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2015 |  | $ 12.4 |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2015 |  |  | 99.2 | 36.8 |  |  |
Balance at beginning of period at Dec. 31, 2015 | $ 267.8 | 0.0 | $ 1.0 | $ (1,174.4) | $ 463.4 | $ 1,074.2 | $ (96.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 190.6 |  |  |  |  | 190.6 |
Net income (loss) attributable to noncontrolling interests |  | (4.8) |  |  |  |  |
Net loss attributable to non-controlling interests | 0.8 | 0.8 |  |  |  |  |
Acquisition of non-controlling interest in subsidiary | 3.8 | 3.8 |  |  |  |  |
Adjustment to pension liability, net of tax | (0.8) |  |  |  |  |  | (0.8)
Unrealized loss on cash flow hedging derivatives, net of tax | (6.0) |  |  |  |  |  | (6.0)
Foreign currency adjustments | (0.3) |  |  |  |  |  | (0.3)
Exercise of stock options (in shares) |  |  |  | (0.6) |  |  |
Exercise of stock options | 15.7 |  |  | $ 7.9 | 7.8 |  |
Issuances of PRSUs, RSUs and DSUs (shares) |  |  |  | (0.1) |  |  |
Issuances of PRSUs, RSUs, and DSUs | (0.1) |  |  | $ 1.5 | (1.6) |  |
Tax adjustments related to stock compensation | $ 7.0 |  |  |  | 7.0 |  |
Treasury stock repurchased (in shares) | 8.7 |  |  | 8.7 |  |  |
Treasury stock repurchased | $ (533.0) |  |  | $ (533.0) |  |  |
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares) |  |  |  | 0.0 |  |  |
Treasury stock repurchased - PRSU/RSU/DSU releases | (2.0) |  |  | $ (2.0) |  |  |
Amortization of unearned stock-based compensation | 16.2 |  |  |  | 16.2 |  |
Balance at end of period at Dec. 31, 2016 |  | 7.6 |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2016 |  |  | 99.2 | 44.8 |  |  |
Balance at ending of period at Dec. 31, 2016 | (41.9) | 3.0 | $ 1.0 | $ (1,700.0) | 492.8 | 1,264.8 | (103.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 151.4 |  |  |  |  | 151.4 |
Net income (loss) attributable to noncontrolling interests |  | (5.4) |  |  |  |  |
Net loss attributable to non-controlling interests | 5.3 | 5.3 |  |  |  |  |
Adjustment to pension liability, net of tax | (0.5) |  |  |  |  |  | (0.5)
Unrealized loss on cash flow hedging derivatives, net of tax | (0.6) |  |  |  |  |  | (0.6)
Foreign currency adjustments | 29.1 |  |  |  |  |  | 29.1
Exercise of stock options (in shares) |  |  |  | (0.3) |  |  |
Exercise of stock options | $ 12.8 |  |  | $ 4.5 | 8.3 |  |
Issuances of PRSUs, RSUs and DSUs (shares) |  |  |  | (0.2) |  |  |
Issuances of PRSUs, RSUs, and DSUs |  |  |  | $ 3.2 | (3.2) |  |
Treasury stock repurchased (in shares) | 0.6 |  |  | 0.6 |  |  |
Treasury stock repurchased | $ (40.1) |  |  | $ (40.1) |  |  |
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares) |  |  |  | 0.1 |  |  |
Treasury stock repurchased - PRSU/RSU/DSU releases | (4.8) |  |  | $ (4.8) |  |  |
Amortization of unearned stock-based compensation | 13.3 |  |  |  | 13.3 |  |
Acquisition of non-controlling interest | (0.9) | (2.3) |  |  | (3.2) |  |
Balance at end of period at Dec. 31, 2017 |  | 2.2 |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2017 |  |  | 99.2 | 45.0 |  |  |
Balance at ending of period at Dec. 31, 2017 | 112.5 | 0.0 | $ 1.0 | $ (1,737.2) | 508.0 | 1,416.2 | (75.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 100.5 |  |  |  |  | 100.5 |
Net income (loss) attributable to noncontrolling interests |  | (2.7) |  |  |  |  |
Net loss attributable to non-controlling interests | (0.2) | (0.2) |  |  |  |  |
Acquisition of non-controlling interest in subsidiary | 3.1 | 3.1 |  |  |  |  |
Adjustment to pension liability, net of tax | (0.9) |  |  |  |  |  |
Adjustment to pension liability, net of tax | 0.4 |  |  |  |  |  | (0.4)
Unrealized loss on cash flow hedging derivatives, net of tax | 0.0 |  |  |  |  |  |
Foreign currency adjustments | (18.9) |  |  |  |  |  | (18.9)
Exercise of stock options (in shares) |  |  |  | (0.2) |  |  |
Exercise of stock options | 4.6 |  |  | $ 2.1 | 2.5 |  |
Issuances of PRSUs, RSUs and DSUs (shares) |  |  |  | (0.2) |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  |  | $ 2.7 | (2.7) |  |
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares) |  |  |  | 0.1 |  |  |
Treasury stock repurchased - PRSU/RSU/DSU releases | (4.6) |  |  | $ (4.6) |  |  |
Amortization of unearned stock-based compensation | 24.8 |  |  |  | 24.8 |  |
Acquisition of non-controlling interest | (0.5) | (0.5) |  |  | (0.5) |  |
Balance at end of period at Dec. 31, 2018 |  | 0.0 |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2018 |  |  | 99.2 | 44.7 |  |  |
Balance at ending of period at Dec. 31, 2018 | $ 217.5 | $ 2.9 | $ 1.0 | $ (1,737.0) | $ 532.1 | $ 1,513.8 | $ (95.3)

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