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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 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, 2012 |  | $ 0.0 |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2012 |  |  | 99.2 | 39.5 |  |  |
Balance at beginning of period at Dec. 31, 2012 | $ 22.3 |  | $ 1.0 | $ (1,199.4) | $ 379.0 | $ 849.3 | $ (7.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Acquisition of redeemable non-controlling interest |  | 11.2 |  |  |  |  |
Net income | 78.6 |  |  |  |  | 78.6 |
Net income attributable to non-controlling interest | 0.3 | 0.3 |  |  |  |  |
Adjustment to pension liability, net of tax | 3.2 |  |  |  |  |  | 3.2
Derivative instruments accounted for as hedges, net of tax | 1.3 |  |  |  |  |  | 1.3
Foreign currency adjustments | (10.6) |  |  |  |  |  | (10.6)
Exercise of stock options (in shares) |  |  |  | (0.6) |  |  |
Exercise of stock options | 8.7 |  |  | $ 6.9 | 1.8 |  |
Issuances of PRSUs, RSUs and DSUs (shares) |  |  |  | (0.3) |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  |  | $ 6.4 | (6.4) |  |
Tax adjustments related to stock compensation | 5.2 |  |  |  | 5.2 |  |
Treasury stock repurchased | (7.0) |  |  | $ (7.0) |  |  |
Amortization of unearned stock-based compensation | 16.9 |  |  |  | 16.9 |  |
Balance at end of period at Dec. 31, 2013 |  | 11.5 |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2013 |  |  | 99.2 | 38.6 |  |  |
Balance at end of period at Dec. 31, 2013 | 118.6 |  | $ 1.0 | $ (1,193.1) | 396.5 | 927.9 | (13.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 108.9 |  |  |  |  | 108.9 |
Net income attributable to non-controlling interest | 1.1 | 1.1 |  |  |  |  |
Adjustment to pension liability, net of tax | (5.6) |  |  |  |  |  | (5.6)
Derivative instruments accounted for as hedges, net of tax | 2.0 |  |  |  |  |  | 2.0
Foreign currency adjustments | (38.4) |  |  |  |  |  | (38.4)
Exercise of stock options (in shares) |  |  |  | (0.2) |  |  |
Exercise of stock options | 4.3 |  |  | $ 2.5 | 1.8 |  |
Issuances of PRSUs, RSUs and DSUs (shares) |  |  |  | (0.1) |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  |  | $ 1.5 | (1.5) |  |
Tax adjustments related to stock compensation | 1.7 |  |  |  | 1.7 |  |
Treasury stock repurchased | (2.2) |  |  | $ (2.2) |  |  |
Amortization of unearned stock-based compensation | 13.4 |  |  |  | 13.4 |  |
Balance at end of period at Dec. 31, 2014 | 12.6 | 12.6 |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2014 |  |  | 99.2 | 38.3 |  |  |
Balance at end of period at Dec. 31, 2014 | 202.7 |  | $ 1.0 | $ (1,191.3) | 411.9 | 1,036.8 | (55.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 73.5 |  |  |  |  | 73.5 |
Net income attributable to non-controlling interest | 1.2 | 1.2 |  |  |  |  |
Distributions paid to non-controlling interest |  | (1.4) |  |  |  |  |
Adjustment to pension liability, net of tax | 1.0 |  |  |  |  |  | 1.0
Derivative instruments accounted for as hedges, net of tax | 6.0 |  |  |  |  |  | 6.0
Foreign currency adjustments | (61.4) |  |  |  |  |  | (61.4)
Exercise of stock options (in shares) |  |  |  | (1.3) |  |  |
Exercise of stock options | 20.4 |  |  | $ 16.5 | 3.9 |  |
Treasury shares issed (in shares) |  |  |  | (0.1) |  |  |
Treasury stock issued to CEO | 5.0 |  |  | $ 0.9 | 4.1 |  |
Issuances of PRSUs, RSUs and DSUs (shares) |  |  |  | (0.1) |  |  |
Issuances of PRSUs, RSUs, and DSUs | 0.0 |  |  | $ 0.8 | (0.8) |  |
Tax adjustments related to stock compensation | 21.8 |  |  |  | 21.8 |  |
Treasury stock repurchased | (1.3) |  |  | $ (1.3) |  |  |
Amortization of unearned stock-based compensation | 22.5 |  |  |  | 22.5 |  |
Balance at end of period at Dec. 31, 2015 | 12.4 | $ 12.4 |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2015 |  |  | 99.2 | 36.8 |  |  |
Balance at end of period at Dec. 31, 2015 | $ 290.2 |  | $ 1.0 | $ (1,174.4) | $ 463.4 | $ 1,110.3 | $ (110.1)

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