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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Millions | Total | Cumulative Effect, Period Of Adoption, Adjustment | Common Stock | Treasury Stock | Additional Paid in Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period Of Adoption, Adjustment | Accumulated Other Comprehensive Loss | Non-controlling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (in shares) at Dec. 31, 2019 |  |  | 283,800 | 75,100 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | $ 360.4 | $ (6.5) | $ 2.8 | $ (1,832.8) | $ 573.9 | $ 1,703.3 | $ (6.5) | $ (87.7) | $ 0.9
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 59.7 |  |  |  |  | 59.7 |  |  |
Net income attributable to non-controlling interests | 0.1 |  |  |  |  |  |  |  | 0.1
Foreign currency adjustments, net of tax | (23.0) |  |  |  |  |  |  | (23.0) |
Exercise of stock options | 1.3 |  |  | $ 0.3 | 1.0 |  |  |  |
Issuances of PRSUs, RSUs, and DSUs (in shares) |  |  |  | (400) |  |  |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  |  | $ 5.3 | (5.3) |  |  |  |
Treasury stock repurchased (in shares) |  |  |  | 2,600 |  |  |  |  |
Treasury stock repurchased | (187.5) |  |  | $ (187.5) |  |  |  |  |
Treasury stock repurchased - PRSU/RSU releases (in shares) |  |  |  | 100 |  |  |  |  |
Treasury stock repurchased - PRSU/RSU releases | (11.8) |  |  | $ (11.8) |  |  |  |  |
Amortization of unearned stock-based compensation | 7.3 |  |  |  | 7.3 |  |  |  |
Balance at ending of period (in shares) at Mar. 31, 2020 |  |  | 283,800 | 77,400 |  |  |  |  |
Balance at end of period at Mar. 31, 2020 | 200.0 |  | $ 2.8 | $ (2,026.5) | 576.9 | 1,756.5 |  | (110.7) | 1.0
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2019 | 0.0 |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Acquisition of non-controlling interest in subsidiary | 8.4 |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, ending balance at Mar. 31, 2020 | 8.4 |  |  |  |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2020 |  |  | 283,800 | 78,900 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2020 | 504.6 |  | $ 2.8 | $ (2,096.8) | 617.5 | 2,045.6 |  | (65.5) | 1.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 130.5 |  |  |  |  | 130.5 |  |  |
Net income attributable to non-controlling interests | 0.2 |  |  |  |  |  |  |  | 0.2
Foreign currency adjustments, net of tax | (10.8) |  |  |  |  |  |  | (10.8) |
Exercise of stock options (in shares) |  |  |  | (400) |  |  |  |  |
Exercise of stock options | 6.6 |  |  | $ 10.9 | (4.3) |  |  |  |
Dividends on common stock | (14.8) |  |  |  |  | (14.8) |  |  |
Issuances of PRSUs, RSUs, and DSUs (in shares) |  |  |  | (1,500) |  |  |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  |  | $ 38.3 | (38.3) |  |  |  |
Treasury stock repurchased (in shares) |  |  |  | 8,400 |  |  |  |  |
Treasury stock repurchased | (299.8) |  |  | $ (299.8) |  |  |  |  |
Treasury stock repurchased - PRSU/RSU releases (in shares) |  |  |  | 500 |  |  |  |  |
Treasury stock repurchased - PRSU/RSU releases | (13.3) |  |  | $ (13.3) |  |  |  |  |
Amortization of unearned stock-based compensation | 15.1 |  |  |  | 15.1 |  |  |  |
Balance at ending of period (in shares) at Mar. 31, 2021 |  |  | 283,800 | 85,900 |  |  |  |  |
Balance at end of period at Mar. 31, 2021 | 318.3 |  | $ 2.8 | $ (2,360.7) | $ 590.0 | $ 2,161.3 |  | $ (76.3) | $ 1.2
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2020 | 8.9 |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, ending balance at Mar. 31, 2021 | $ 8.9 |  |  |  |  |  |  |  |

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