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STATEMENTS OF CONSOLIDATED STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions | Total | Common Stock | Additional Paid in Capital | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 |  | $ 740.4 | $ 0.2 | $ 1,059.3 | $ 150.2 | $ (420.5) | $ (48.8)
Beginning balance (shares) at Dec. 31, 2018 |  |  | 16,234,603 |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net (loss) income |  | 28.0 |  |  | 28.0 |  |
Other comprehensive income (loss), net of tax |  | 9.7 |  |  |  |  | 9.7
Common shares issued (including impacts from Long-Term Incentive programs) (shares) |  |  | 122,309 |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares |  | (5.0) |  | (5.0) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares) |  |  | (46,388) |  |  |  |
Repurchase of common stock | [1] | (17.4) |  |  |  | (17.4) |
Repurchase of common stock (shares) | [1] |  | (175,977) |  |  |  |
Cash dividends declared | [2] | (10.2) |  |  | (10.2) |  |
Amortization of unearned equity compensation |  | 2.4 |  | 2.4 |  |  |
Ending balance at Mar. 31, 2019 |  | 747.9 | $ 0.2 | 1,056.7 | 168.0 | (437.9) | (39.1)
Ending balance (shares) at Mar. 31, 2019 |  |  | 16,134,547 |  |  |  |
Beginning balance at Dec. 31, 2018 |  | 740.4 | $ 0.2 | 1,059.3 | 150.2 | (420.5) | (48.8)
Beginning balance (shares) at Dec. 31, 2018 |  |  | 16,234,603 |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net (loss) income |  | 47.2 |  |  |  |  |
Other comprehensive income (loss), net of tax |  | 6.5 |  |  |  |  |
Ending balance at Jun. 30, 2019 |  | 746.3 | $ 0.2 | 1,059.2 | 177.3 | (448.1) | (42.3)
Ending balance (shares) at Jun. 30, 2019 |  |  | 16,028,675 |  |  |  |
Beginning balance at Mar. 31, 2019 |  | 747.9 | $ 0.2 | 1,056.7 | 168.0 | (437.9) | (39.1)
Beginning balance (shares) at Mar. 31, 2019 |  |  | 16,134,547 |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net (loss) income |  | 19.2 |  |  | 19.2 |  |
Other comprehensive income (loss), net of tax |  | (3.2) |  |  |  |  | (3.2)
Common shares issued (including impacts from Long-Term Incentive programs) |  | 0.3 |  | 0.3 |  |  |
Common shares issued (including impacts from Long-Term Incentive programs) (shares) |  |  | 14,700 |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares |  | (1.2) |  | (1.2) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares) |  |  | (12,395) |  |  |  |
Repurchase of common stock | [1] | (10.2) |  |  |  | (10.2) |
Repurchase of common stock (shares) | [1] |  | (108,177) |  |  |  |
Cash dividends declared | [2] | (9.9) |  |  | (9.9) |  |
Amortization of unearned equity compensation |  | 3.4 |  | 3.4 |  |  |
Ending balance at Jun. 30, 2019 |  | 746.3 | $ 0.2 | 1,059.2 | 177.3 | (448.1) | (42.3)
Ending balance (shares) at Jun. 30, 2019 |  |  | 16,028,675 |  |  |  |
Beginning balance at Dec. 31, 2019 |  | $ 733.9 | $ 0.2 | 1,062.9 | 172.8 | (463.4) | (38.6)
Beginning balance (shares) at Dec. 31, 2019 |  | 15,868,304 | 15,868,304 |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net (loss) income |  | $ 29.1 |  |  | 29.1 |  |
Other comprehensive income (loss), net of tax |  | (15.5) |  |  |  |  | (15.5)
Common shares issued (including impacts from Long-Term Incentive programs) (shares) | [3] |  | 119,598 |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares |  | (4.3) |  | (4.3) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares) |  |  | (45,545) |  |  |  |
Repurchase of common stock | [4] | (12.5) |  |  |  | (12.5) |
Repurchase of common stock (shares) | [4] |  | (152,763) |  |  |  |
Cash dividends declared | [5] | (11.3) |  |  | (11.3) |  |
Amortization of unearned equity compensation |  | 1.7 |  | 1.7 |  |  |
Ending balance at Mar. 31, 2020 |  | 721.1 | $ 0.2 | 1,060.3 | 190.6 | (475.9) | (54.1)
Ending balance (shares) at Mar. 31, 2020 |  |  | 15,789,594 |  |  |  |
Beginning balance at Dec. 31, 2019 |  | $ 733.9 | $ 0.2 | 1,062.9 | 172.8 | (463.4) | (38.6)
Beginning balance (shares) at Dec. 31, 2019 |  | 15,868,304 | 15,868,304 |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net (loss) income |  | $ 22.5 |  |  |  |  |
Other comprehensive income (loss), net of tax |  | (3.6) |  |  |  |  |
Ending balance at Jun. 30, 2020 |  | $ 718.8 | $ 0.2 | 1,063.3 | 173.4 | (475.9) | (42.2)
Ending balance (shares) at Jun. 30, 2020 |  | 15,812,169 | 15,812,169 |  |  |  |
Beginning balance at Mar. 31, 2020 |  | $ 721.1 | $ 0.2 | 1,060.3 | 190.6 | (475.9) | (54.1)
Beginning balance (shares) at Mar. 31, 2020 |  |  | 15,789,594 |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net (loss) income |  | (6.6) |  |  | (6.6) |  |
Other comprehensive income (loss), net of tax |  | 11.9 |  |  |  |  | 11.9
Common shares issued (including impacts from Long-Term Incentive programs) | [3] | 0.4 |  | 0.4 |  |  |
Common shares issued (including impacts from Long-Term Incentive programs) (shares) | [3] |  | 22,575 |  |  |  |
Repurchase of common stock (shares) |  |  | 0 |  |  |  |
Cash dividends declared | [5] | (10.6) |  |  | (10.6) |  |
Amortization of unearned equity compensation |  | 2.6 |  | 2.6 |  |  |
Ending balance at Jun. 30, 2020 |  | $ 718.8 | $ 0.2 | $ 1,063.3 | $ 173.4 | $ (475.9) | $ (42.2)
Ending balance (shares) at Jun. 30, 2020 |  | 15,812,169 | 15,812,169 |  |  |  |
[1] | Weighted-average repurchase price (dollars per share) for the quarters ended March 31, 2019 and June 30, 2019 was $98.55 and $95.00.
[2] | Dividends declared per common share were $0.60 for each of the quarters ended March 31, 2019 and June 30, 2019.
[3] | At June 30, 2020, 358,122 shares were available for awards under the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan ("2016 Plan").
[4] | Weighted-average repurchase price (dollars per share) for the quarter ended March 31, 2020 was $81.94. There was no repurchase of common stock for the quarter ended June 30, 2020. At June 30, 2020, $93.1 million remained available to repurchase our common shares pursuant to the stock repurchase program.
[5] | Dividends declared per common share was $0.67 for each of the quarters ended March 31, 2020 and June 30, 2020.

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration