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UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions | Total | Restricted stock units [Member] | Common stock [Member] | Common stock [Member] Restricted stock units [Member] | Additional capital in excess of par value [Member] | Additional capital in excess of par value [Member] Restricted stock units [Member] | Retained earnings [Member] | Accumulated other comprehensive income (loss) [Member] | [2]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 | Accounting standards update 2016-01 [Member] | $ 14.5 |  |  |  |  |  | $ 22.4 | [1] | $ (7.9) | [1]
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 | Accounting standards update 2018-02, currency translation adjustments [Member] |  |  |  |  |  |  | 2.3 |  | (2.3) |
Balances, As Adjusted | 5,838.9 |  | $ 49.0 |  | $ 846.1 |  | 4,957.6 |  | (13.8) |
Balances (in shares) at Dec. 31, 2017 |  |  | 245,111,000 |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | 5,824.4 |  | $ 49.0 |  | 846.1 |  | 4,932.9 |  | (3.6) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income | 453.7 |  |  |  |  |  | 453.7 |  |  |
Other comprehensive income (loss), net of tax | 7.4 |  |  |  |  |  |  |  | 7.4 |
Dividends declared | (174.9) |  |  |  |  |  | (174.9) |  |  |
Common stock-based compensation plans activity |  |  |  |  |  |  |  |  |  |
Shares issued upon option exercises (shares) |  |  | 1,103,000 |  |  |  |  |  |  |
Shares issued upon option exercises | 45.1 |  | $ 0.2 |  | 44.9 |  |  |  |  |
Net shares issued upon vesting of restricted stock units (in shares) |  |  |  | 6,000 |  |  |  |  |  |
Net shares issued upon vesting of restricted stock units |  | $ (0.4) |  | $ 0.0 |  | $ (0.4) |  |  |  |
Forfeiture of restricted awards (shares) |  |  | (4,000) |  |  |  |  |  |  |
Forfeiture of restricted awards |  |  | $ 0.0 |  | 0.0 |  |  |  |  |
Stock-based compensation expense | 45.6 |  |  |  | 45.6 |  |  |  |  |
Restricted stock units issued as dividend equivalents | 0.0 |  |  |  | 0.1 |  | (0.1) |  |  |
Common shares repurchased (shares) |  |  | (2,934,000) |  |  |  |  |  |  |
Common shares repurchased | (313.5) |  | $ (0.5) |  | (281.7) |  | (31.3) |  |  |
Balances (in shares) at Mar. 31, 2018 |  |  | 243,282,000 |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2018 | 5,901.9 |  | $ 48.7 |  | 654.6 |  | 5,205.0 |  | (6.4) |
Beginning balances attributable to redeemable non-controlling interests at Dec. 31, 2017 | 992.8 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable non-controlling interests | 1.8 |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests | 7.0 |  |  |  |  |  |  |  |  |
Net subscriptions into consolidated T. Rowe Price investment products | 177.8 |  |  |  |  |  |  |  |  |
Net reconsolidations of T. Rowe Price investment products | (632.9) |  |  |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Mar. 31, 2018 | 546.5 |  |  |  |  |  |  |  |  |
Balances (in shares) at Dec. 31, 2018 |  |  | 238,069,000 |  |  |  |  |  |  |
Beginning Balance 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 (shares) | 972,655 |  | 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) |  | $ 0.0 |  | $ (1.2) |  |  |  |
Forfeiture of restricted awards (shares) |  |  | (5,000) |  |  |  |  |  |  |
Forfeiture of restricted awards |  |  | $ 0.0 |  | 0.0 |  |  |  |  |
Stock-based compensation expense | 43.5 |  |  |  | 43.5 |  |  |  |  |
Common shares repurchased (shares) |  |  | (2,476,000) |  |  |  |  |  |  |
Common shares repurchased | (229.8) |  | $ (0.5) |  | (87.2) |  | (142.1) |  |  |
Balances (in shares) at Mar. 31, 2019 |  |  | 236,432,000 |  |  |  |  |  |  |
Ending Balance 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 of T. Rowe Price investment products | 20.4 |  |  |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Mar. 31, 2019 | $ 886.7 |  |  |  |  |  |  |  |  |
[1] | ncludes the reclassification of $1.7 million of stranded income taxes on certain investments resulting from U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.
[2] | Accumulated other comprehensive income.

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