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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions | Total | Restricted stock units | Common stock | Common stock Restricted stock units | Additional capital in excess of par value | Additional capital in excess of par value Restricted stock units | Retained earnings | AOCI | [1]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2019 |  |  | 235,214,000 |  |  |  |  |
Balances at beginning of period at Dec. 31, 2019 | $ 7,102.1 |  | $ 47.0 |  | $ 654.6 |  | $ 6,443.5 | $ (43.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 343.1 |  |  |  |  |  | 343.1 |
Other comprehensive income (loss), net of tax | (6.1) |  |  |  |  |  |  | (6.1)
Dividends declared | (214.7) |  |  |  |  |  | (214.7) |
Shares issued upon option exercises (in shares) |  |  | 1,068,000 |  |  |  |  |
Shares issued upon option exercises | 41.3 |  | $ 0.2 |  | 41.1 |  |  |
Net shares issued upon vesting of restricted stock units (in shares) |  |  |  | 37,000 |  |  |  |
Net shares issued upon vesting of restricted stock units |  | $ (3.0) |  |  |  | $ (3.0) |  |
Stock-based compensation expense | 58.3 |  |  |  | 58.3 |  |  |
Restricted stock units issued as dividend equivalents | 0.0 |  |  |  | 0.1 |  | (0.1) |
Common shares repurchased (in shares) |  |  | (8,334,000) |  |  |  |  |
Common shares repurchased | (887.0) |  | $ (1.6) |  | (96.5) |  | (788.9) |
Ending balance (in shares) at Mar. 31, 2020 |  |  | 227,985,000 |  |  |  |  |
Balances at end of period at Mar. 31, 2020 | 6,434.0 |  | $ 45.6 |  | 654.6 |  | 5,782.9 | (49.1)
Beginning balances attributable to redeemable non-controlling interests at Dec. 31, 2019 | 1,121.0 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable non-controlling interests | (176.5) |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests | 17.2 |  |  |  |  |  |  |
Net subscriptions into consolidated T. Rowe Price investment products | 63.8 |  |  |  |  |  |  |
Net deconsolidations of T. Rowe Price investment products | (20.1) |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Mar. 31, 2020 | 971.0 |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2020 |  |  | 227,965,000 |  |  |  |  |
Balances at beginning of period at Dec. 31, 2020 | 7,707.0 |  | $ 45.6 |  | 654.6 |  | 7,029.8 | (23.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 749.4 |  |  |  |  |  | 749.4 |
Other comprehensive income (loss), net of tax | (7.5) |  |  |  |  |  |  | (7.5)
Dividends declared | $ (252.3) |  |  |  |  |  | (252.3) |
Shares issued upon option exercises (in shares) | 748,203 |  | 572,000 |  |  |  |  |
Shares issued upon option exercises | $ 25.4 |  | $ 0.1 |  | 25.3 |  |  |
Net shares issued upon vesting of restricted stock units (in shares) |  |  |  | 41,000 |  |  |  |
Net shares issued upon vesting of restricted stock units |  | $ (3.7) |  |  |  | $ (3.7) |  |
Stock-based compensation expense | 57.5 |  |  |  | 57.5 |  |  |
Restricted stock units issued as dividend equivalents |  |  |  |  | 0.1 |  | (0.1) |
Common shares repurchased (in shares) |  |  | (1,630,000) |  |  |  |  |
Common shares repurchased | (267.6) |  | $ (0.3) |  | (79.2) |  | (188.1) |
Ending balance (in shares) at Mar. 31, 2021 |  |  | 226,948,000 |  |  |  |  |
Balances at end of period at Mar. 31, 2021 | 8,008.2 |  | $ 45.4 |  | $ 654.6 |  | $ 7,338.7 | $ (30.5)
Beginning balances attributable to redeemable non-controlling interests at Dec. 31, 2020 | 1,561.7 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable non-controlling interests | 15.4 |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests | 11.8 |  |  |  |  |  |  |
Net subscriptions into consolidated T. Rowe Price investment products | 187.5 |  |  |  |  |  |  |
Net deconsolidations of T. Rowe Price investment products | (739.9) |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Mar. 31, 2021 | $ 1,012.9 |  |  |  |  |  |  |
[1] | Accumulated other comprehensive income.

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