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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 | Accounting standards update 2016-01 [Member] | [1] | $ 14.5 |  |  |  |  |  | $ 22.4 | $ (7.9)
Cumulative effect adjustment upon adoption of new accounting guidance | Accounting standards update 2018-02, currency translation adjustments [Member] |  | 0.0 |  |  |  |  |  | 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 |  | 902.6 |  |  |  |  |  | 902.6 |
Other comprehensive income (loss), net of tax |  | (9.9) |  |  |  |  |  |  | (9.9)
Dividends declared |  | (348.8) |  |  |  |  |  | (348.8) |
Common stock-based compensation plans activity |  |  |  |  |  |  |  |  |
Shares issued upon option exercises (shares) |  |  |  | 2,241,000 |  |  |  |  |
Shares issued upon option exercises |  | 92.1 |  | $ 0.4 |  | 91.7 |  |  |
Restricted shares issued, net of shares withheld for taxes (in shares) |  |  |  |  | 8,000 |  |  |  |
Restricted shares issued, net of shares withheld for taxes |  |  | $ (0.1) |  |  |  | $ (0.1) |  |
Net shares issued upon vesting of restricted stock units (in shares) |  |  |  |  | 56,000 |  |  |  |
Net shares issued upon vesting of restricted stock units |  |  | (0.7) |  |  |  | (0.7) |  |
Forfeiture of restricted awards (shares) |  |  |  | (6,000) |  |  |  |  |
Stock-based compensation expense |  | 90.8 |  |  |  | 90.8 |  |  |
Restricted stock units issued as dividend equivalents |  |  |  |  |  | 0.1 |  | (0.1) |
Common shares repurchased (shares) |  |  |  | (4,230,000) |  |  |  |  |
Common shares repurchased |  | (450.3) |  | $ (0.8) |  | (373.3) |  | (76.2) |
Balances (in shares) at Jun. 30, 2018 |  |  |  | 243,180,000 |  |  |  |  |
Ending Balance at Jun. 30, 2018 |  | 6,114.6 |  | $ 48.6 |  | 654.6 |  | 5,435.1 | (23.7)
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 |  | 12.5 |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests |  | (13.5) |  |  |  |  |  |  |
Net subscriptions into consolidated T. Rowe Price investment products |  | 322.6 |  |  |  |  |  |  |
Net reconsolidations (deconsolidations) of T. Rowe Price investment products |  | (575.2) |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Jun. 30, 2018 |  | 739.2 |  |  |  |  |  |  |
Balances (in shares) at Mar. 31, 2018 |  |  |  | 243,282,000 |  |  |  |  |
Beginning Balance at Mar. 31, 2018 |  | 5,901.9 |  | $ 48.7 |  | 654.6 |  | 5,205.0 | (6.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income |  | 448.9 |  |  |  |  |  | 448.9 |
Other comprehensive income (loss), net of tax |  | (17.3) |  |  |  |  |  |  | (17.3)
Dividends declared |  | (173.9) |  |  |  |  |  | (173.9) |
Common stock-based compensation plans activity |  |  |  |  |  |  |  |  |
Shares issued upon option exercises (shares) |  |  |  | 1,138,000 |  |  |  |  |
Shares issued upon option exercises |  | 47.0 |  | $ 0.2 |  | 46.8 |  |  |
Restricted shares issued, net of shares withheld for taxes (in shares) |  |  |  |  | 8,000 |  |  |  |
Restricted shares issued, net of shares withheld for taxes |  |  | (0.1) |  |  |  | (0.1) |  |
Net shares issued upon vesting of restricted stock units (in shares) |  |  |  |  | 50,000 |  |  |  |
Net shares issued upon vesting of restricted stock units |  |  | (0.3) |  |  |  | (0.3) |  |
Forfeiture of restricted awards (shares) |  |  |  | (2,000) |  |  |  |  |
Stock-based compensation expense |  | 45.2 |  |  |  | 45.2 |  |  |
Common shares repurchased (shares) |  |  |  | (1,296,000) |  |  |  |  |
Common shares repurchased |  | (136.8) |  | $ (0.3) |  | (91.6) |  | (44.9) |
Balances (in shares) at Jun. 30, 2018 |  |  |  | 243,180,000 |  |  |  |  |
Ending Balance at Jun. 30, 2018 |  | 6,114.6 |  | $ 48.6 |  | 654.6 |  | 5,435.1 | (23.7)
Beginning balances attributable to redeemable non-controlling interests at Mar. 31, 2018 |  | 546.5 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable non-controlling interests |  | 10.7 |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests |  | (20.5) |  |  |  |  |  |  |
Net subscriptions into consolidated T. Rowe Price investment products |  | 144.8 |  |  |  |  |  |  |
Net reconsolidations (deconsolidations) of T. Rowe Price investment products |  | 57.7 |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Jun. 30, 2018 |  | 739.2 |  |  |  |  |  |  |
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 |  | 1,040.1 |  |  |  |  |  | 1,040.1 |
Other comprehensive income (loss), net of tax |  | 3.5 |  |  |  |  |  |  | 3.5
Dividends declared |  | $ (367.2) |  |  |  |  |  | (367.2) |
Common stock-based compensation plans activity |  |  |  |  |  |  |  |  |
Shares issued upon option exercises (shares) |  | 1,765,404 |  | 1,495,000 |  |  |  |  |
Shares issued upon option exercises |  | $ 82.8 |  | $ 0.3 |  | 82.5 |  |  |
Restricted shares issued, net of shares withheld for taxes (in shares) |  |  |  |  | 7,000 |  |  |  |
Restricted shares issued, net of shares withheld for taxes |  |  | (0.1) |  |  |  | (0.1) |  |
Net shares issued upon vesting of restricted stock units (in shares) |  |  |  |  | 33,000 |  |  |  |
Net shares issued upon vesting of restricted stock units |  |  | (1.4) |  |  |  | (1.4) |  |
Forfeiture of restricted awards (shares) |  |  |  | (7,000) |  |  |  |  |
Stock-based compensation expense |  | 90.7 |  |  |  | 90.7 |  |  |
Restricted stock units issued as dividend equivalents |  | 0.0 |  |  |  | 0.1 |  | (0.1) |
Common shares repurchased (shares) |  |  |  | (4,079,000) |  |  |  |  |
Common shares repurchased |  | (393.6) |  | $ (0.8) |  | (171.8) |  | (221.0) |
Balances (in shares) at Jun. 30, 2019 |  |  |  | 235,518,000 |  |  |  |  |
Ending Balance at Jun. 30, 2019 |  | 6,579.1 |  | $ 47.1 |  | 654.6 |  | 5,915.9 | (38.5)
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 |  | 69.8 |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests |  | (0.3) |  |  |  |  |  |  |
Net subscriptions into consolidated T. Rowe Price investment products |  | 211.6 |  |  |  |  |  |  |
Net reconsolidations (deconsolidations) of T. Rowe Price investment products |  | (9.1) |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Jun. 30, 2019 |  | 1,012.3 |  |  |  |  |  |  |
Balances (in shares) at Mar. 31, 2019 |  |  |  | 236,432,000 |  |  |  |  |
Beginning Balance at Mar. 31, 2019 |  | 6,311.0 |  | $ 47.3 |  | 654.5 |  | 5,650.8 | (41.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income |  | 527.5 |  |  |  |  |  | 527.5 |
Other comprehensive income (loss), net of tax |  | 3.1 |  |  |  |  |  |  | 3.1
Dividends declared |  | (183.4) |  |  |  |  |  | (183.4) |
Common stock-based compensation plans activity |  |  |  |  |  |  |  |  |
Shares issued upon option exercises (shares) |  |  |  | 665,000 |  |  |  |  |
Shares issued upon option exercises |  | 37.8 |  | $ 0.1 |  | 37.7 |  |  |
Net shares issued upon vesting of restricted stock units (in shares) |  |  |  |  | 19,000 |  |  |  |
Net shares issued upon vesting of restricted stock units |  |  | $ (0.2) |  |  |  | $ (0.2) |  |
Forfeiture of restricted awards (shares) |  |  |  | (2,000) |  |  |  |  |
Stock-based compensation expense |  | 47.2 |  |  |  | 47.2 |  |  |
Common shares repurchased (shares) |  |  |  | (1,603,000) |  |  |  |  |
Common shares repurchased |  | (163.8) |  | $ (0.3) |  | (84.6) |  | (78.9) |
Balances (in shares) at Jun. 30, 2019 |  |  |  | 235,518,000 |  |  |  |  |
Ending Balance at Jun. 30, 2019 |  | 6,579.1 |  | $ 47.1 |  | $ 654.6 |  | $ 5,915.9 | $ (38.5)
Beginning balances attributable to redeemable non-controlling interests at Mar. 31, 2019 |  | 886.7 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable non-controlling interests |  | 28.4 |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests |  | 1.0 |  |  |  |  |  |  |
Net subscriptions into consolidated T. Rowe Price investment products |  | 125.7 |  |  |  |  |  |  |
Net reconsolidations (deconsolidations) of T. Rowe Price investment products |  | (29.5) |  |  |  |  |  |  |
Ending balances attributable to redeemable non-controlling interests at Jun. 30, 2019 |  | $ 1,012.3 |  |  |  |  |  |  |
[1] | Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale 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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