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UNAUDITED CONDENSED CONSOLIDATED STATEMENT 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 Balances (in shares) at Dec. 31, 2018 |  |  | 238,069,000 |  |  |  |  |
Balances at beginning of period at Dec. 31, 2018 | $ 6,124.3 |  | $ 47.6 |  | $ 654.6 |  | $ 5,464.1 | $ (42.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 512.6 |  |  |  |  |  | 512.6 |
Other comprehensive income (loss), net of tax | 0.4 |  |  |  |  |  |  | 0.4
Dividends declared | (183.8) |  |  |  |  |  | (183.8) |
Common stock-based compensation plans activity |  |  |  |  |  |  |  |
Shares issued upon option exercises (in shares) |  |  | 830,000 |  |  |  |  |
Shares issued upon option exercises | 45.0 |  | $ 0.2 |  | 44.8 |  |  |
Net shares issued upon vesting of restricted stock units (in shares) |  |  |  | 14,000 |  |  |  |
Net shares issued upon vesting of restricted stock units |  | $ (1.2) |  |  |  | $ (1.2) |  |
Forfeiture of restricted awards (in shares) |  |  | (5,000) |  |  |  |  |
Stock-based compensation expense | 43.5 |  |  |  | 43.5 |  |  |
Common shares repurchased (in shares) |  |  | (2,476,000) |  |  |  |  |
Common shares repurchased | (229.8) |  | $ (0.5) |  | (87.2) |  | (142.1) |
Ending Balances (in shares) at Mar. 31, 2019 |  |  | 236,432,000 |  |  |  |  |
Balances at end of period at Mar. 31, 2019 | 6,311.0 |  | $ 47.3 |  | 654.5 |  | 5,650.8 | (41.6)
Beginning balances attributable to redeemable non-controlling interests at Dec. 31, 2018 | 740.3 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable non-controlling interests | 41.4 |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests | (1.3) |  |  |  |  |  |  |
Net subscriptions into consolidated T. Rowe Price investment products | 85.9 |  |  |  |  |  |  |
Net reconsolidations (deconsolidations) of T. Rowe Price investment products | 20.4 |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Mar. 31, 2019 | 886.7 |  |  |  |  |  |  |
Beginning Balances (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) |
Common stock-based compensation plans activity |  |  |  |  |  |  |  |
Shares issued upon option exercises (in shares) | 1,540,694 |  | 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 |  |  |  |  | 0.1 |  | (0.1) |
Common shares repurchased (in shares) |  |  | (8,334,000) |  |  |  |  |
Common shares repurchased | (887.0) |  | $ (1.6) |  | (96.5) |  | (788.9) |
Ending Balances (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 reconsolidations (deconsolidations) of T. Rowe Price investment products | (20.1) |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Mar. 31, 2020 | $ 971.0 |  |  |  |  |  |  |
[1] | Accumulated other comprehensive income.

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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