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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Treasury Stock | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Non-controlling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2017 | $ 2.2 |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net loss attributable to non-controlling interest | (1.8) |  |  |  |  |  |
Balance at end of period at Jun. 30, 2018 | 0.4 |  |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2017 |  | 99.2 | 45.0 |  |  |  |
Balance at beginning 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 Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 45.9 |  |  |  | 45.9 |  |
Net income (loss) attributable to non-controlling interest | (0.1) |  |  |  |  |  | (0.1)
Acquisition of non-controlling interest in subsidiary | 1.3 |  |  |  |  |  | 1.3
Adjustment to pension liability, net of tax | (0.1) |  |  |  |  | (0.1) |
Foreign currency adjustments | (11.1) |  |  |  |  | (11.1) |
Exercise of stock options (in shares) |  |  | (0.1) |  |  |  |
Exercise of stock options | 2.6 |  | $ 1.0 | 1.6 |  |  |
Issuances of PRSUs, RSUs, and DSUs (in shares) |  |  | (0.1) |  |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  | $ 2.3 | (2.3) |  |  |
Treasury stock repurchased (in shares) |  |  | 0.1 |  |  |  |
Treasury stock repurchased | (3.0) |  | $ (3.0) |  |  |  |
Amortization of unearned stock-based compensation | 13.1 |  |  | 13.1 |  |  |
Balance at ending of period (in shares) at Jun. 30, 2018 |  | 99.2 | 44.9 |  |  |  |
Balance at end of period at Jun. 30, 2018 | 157.7 | $ 1.0 | $ (1,736.9) | 520.4 | 1,459.2 | (87.2) | 1.2
Balance at beginning of period at Mar. 31, 2018 | 1.9 |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net loss attributable to non-controlling interest | (1.5) |  |  |  |  |  |
Balance at end of period at Jun. 30, 2018 | 0.4 |  |  |  |  |  |
Balance at beginning of period (in shares) at Mar. 31, 2018 |  | 99.2 | 45.0 |  |  |  |
Balance at beginning of period at Mar. 31, 2018 | 142.4 | $ 1.0 | $ (1,737.5) | 513.6 | 1,436.4 | (71.1) | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 22.8 |  |  |  | 22.8 |  |
Net income (loss) attributable to non-controlling interest | (0.1) |  |  |  |  |  | (0.1)
Acquisition of non-controlling interest in subsidiary | 1.3 |  |  |  |  |  | 1.3
Foreign currency adjustments | (16.1) |  |  |  |  | (16.1) |
Exercise of stock options (in shares) |  |  | (0.1) |  |  |  |
Exercise of stock options | 0.7 |  | $ 0.4 | 0.3 |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  | 0.3 | (0.3) |  |  |
Treasury stock repurchased | (0.1) |  | $ (0.1) |  |  |  |
Amortization of unearned stock-based compensation | 6.8 |  |  | 6.8 |  |  |
Balance at ending of period (in shares) at Jun. 30, 2018 |  | 99.2 | 44.9 |  |  |  |
Balance at end of period at Jun. 30, 2018 | 157.7 | $ 1.0 | $ (1,736.9) | 520.4 | 1,459.2 | (87.2) | 1.2
Balance at beginning of period at Dec. 31, 2018 | 0.0 |  |  |  |  |  |
Balance at end of period at Jun. 30, 2019 | 0.0 |  |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2018 |  | 99.2 | 44.7 |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 217.5 | $ 1.0 | $ (1,737.0) | 532.1 | 1,513.8 | (95.3) | 2.9
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 70.0 |  |  |  | 70.0 |  |
Net income (loss) attributable to non-controlling interest | 0.1 |  |  |  |  |  | 0.1
Repurchase of interest in subsidiary | (1.9) |  |  |  |  |  | (1.9)
Foreign currency adjustments | 7.0 |  |  |  |  | 7.0 |
Exercise of stock options (in shares) |  |  | (0.2) |  |  |  |
Exercise of stock options | 5.5 |  | $ 1.7 | 3.8 |  |  |
Issuances of PRSUs, RSUs, and DSUs (in shares) |  |  | (0.2) |  |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  | $ 3.5 | (3.5) |  |  |
Treasury stock repurchased (in shares) |  |  | 0.1 |  |  |  |
Treasury stock repurchased | (5.5) |  | $ (5.5) |  |  |  |
Amortization of unearned stock-based compensation | 13.2 |  |  | 13.2 |  |  |
Balance at ending of period (in shares) at Jun. 30, 2019 |  | 99.2 | 44.4 |  |  |  |
Balance at end of period at Jun. 30, 2019 | 305.9 | $ 1.0 | $ (1,737.3) | 545.6 | 1,583.8 | (88.3) | 1.1
Balance at beginning of period at Mar. 31, 2019 | 0.0 |  |  |  |  |  |
Balance at end of period at Jun. 30, 2019 | 0.0 |  |  |  |  |  |
Balance at beginning of period (in shares) at Mar. 31, 2019 |  | 99.2 | 44.5 |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | 253.5 | $ 1.0 | $ (1,736.7) | 537.1 | 1,542.2 | (91.3) | 1.2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 41.6 |  |  |  | 41.6 |  |
Net income (loss) attributable to non-controlling interest | (0.1) |  |  |  |  |  | (0.1)
Foreign currency adjustments | 3.0 |  |  |  |  | 3.0 |
Exercise of stock options (in shares) |  |  | (0.1) |  |  |  |
Exercise of stock options | 3.1 |  | $ 0.9 | 2.2 |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  | 0.3 | (0.3) |  |  |
Treasury stock repurchased | (1.8) |  | $ (1.8) |  |  |  |
Amortization of unearned stock-based compensation | 6.6 |  |  | 6.6 |  |  |
Balance at ending of period (in shares) at Jun. 30, 2019 |  | 99.2 | 44.4 |  |  |  |
Balance at end of period at Jun. 30, 2019 | $ 305.9 | $ 1.0 | $ (1,737.3) | $ 545.6 | $ 1,583.8 | $ (88.3) | $ 1.1

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