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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Treasury Stock | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) Income | Non-controlling Interest in Subsidiaries
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2016 | $ 7.6 |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interests | (5.4) |  |  |  |  |  |
Balance at end of period at Dec. 31, 2017 | 2.2 |  |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2016 |  | 99.2 | 44.8 |  |  |  |
Balance at beginning of period at Dec. 31, 2016 | (41.9) | $ 1.0 | $ (1,700.0) | $ 492.8 | $ 1,264.8 | $ (103.5) | $ 3.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 151.4 |  |  |  | 151.4 |  |
Net loss attributable to non-controlling interests | (5.3) |  |  |  |  |  | (5.3)
Acquisition of non-controlling interest in subsidiary | (0.9) |  |  | (3.2) |  |  | 2.3
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 | $ 0.0 |  | $ 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 |  |  |
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 | $ 1.0 | $ (1,737.2) | 508.0 | 1,416.2 | (75.5) | 0.0
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interests | (2.7) |  |  |  |  |  |
Acquisition of non-controlling interest in subsidiary | 3.1 |  |  |  |  |  | 3.1
Balance at end of period at Dec. 31, 2018 | 0.0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 100.5 |  |  |  | 100.5 |  |
Net loss attributable to non-controlling interests | (0.2) |  |  |  |  |  | (0.2)
Acquisition of non-controlling interest in subsidiary | (0.5) |  |  | (0.5) |  |  |
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 |  |  |  |  |  |
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 | $ 1.0 | $ (1,737.0) | 532.1 | 1,513.8 | (95.3) | 2.9
Balance at end of period at Dec. 31, 2019 | 0.0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 189.5 |  |  |  | 189.5 |  |
Net loss attributable to non-controlling interests | (0.1) |  |  |  |  |  | (0.1)
Acquisition of non-controlling interest in subsidiary | (1.9) |  |  |  |  |  | (1.9)
Adjustment to pension liability, net of tax | (1.9) |  |  |  |  | (1.9) |
Unrealized loss on cash flow hedging derivatives, net of tax | 0.0 |  |  |  |  |  |
Foreign currency adjustments | 9.5 |  |  |  |  | 9.5 |
Exercise of stock options (in shares) |  |  | (0.3) |  |  |  |
Exercise of stock options | 17.8 |  | $ 4.8 | 13.0 |  |  |
Issuances of PRSUs, RSUs and DSUs (shares) |  |  | (0.3) |  |  |  |
Issuances of PRSUs, RSUs, and DSUs | $ 0.0 |  | $ 3.7 | (3.7) |  |  |
Treasury stock repurchased (in shares) | 1.3 |  | 1.3 |  |  |  |
Treasury stock repurchased | $ (102.3) |  | $ (102.3) |  |  |  |
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares) |  |  | 0.1 |  |  |  |
Treasury stock repurchased - PRSU/RSU/DSU releases | (3.4) |  | $ (3.4) |  |  |  |
Amortization of unearned stock-based compensation | 26.8 |  |  | 26.8 |  |  |
Charitable stock donation | 8.9 |  | $ 1.4 | 7.5 |  |  |
Charitable stock donation (in shares) |  |  | (0.1) |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2019 |  | 99.2 | 45.4 |  |  |  |
Balance at ending of period at Dec. 31, 2019 | $ 360.4 | $ 1.0 | $ (1,832.8) | $ 575.7 | $ 1,703.3 | $ (87.7) | $ 0.9

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