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SUPPLEMENTARY CONSOLIDATING CASH FLOW STATEMENT. (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 386.6 | $ 404.2 | $ 390.0 | $ 400.4 | $ 366.8 | $ 362.7 | $ 211.2 | $ 313.3 | $ 1,581.2 | [1] | $ 1,254.0 | [1] | $ 1,223.0 | [1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization of property and equipment | [1] |  |  |  |  |  |  |  |  | 143.6 |  | 133.4 |  | 126.3 |
Stock-based compensation expense | [1] |  |  |  |  |  |  |  |  | 152.0 |  | 161.6 |  | 149.0 |
Realized gains on dispositions of available-for-sale sponsored investment portfolios | [1] |  |  |  |  |  |  |  |  | (83.1) |  | (53.0) |  | (56.5) |
Gains recognized upon transfer of an available-for-sale T. Rowe Price investment products to T. Rowe Price investment products held as trading | [1] |  |  |  |  |  |  |  |  | (23.6) |  | 0.0 |  | 0.0 |
Net gains recognized on investments | [1] |  |  |  |  |  |  |  |  | (49.7) |  | (31.0) |  | (5.9) |
Investments in T. Rowe Price mutual funds held as trading to economically hedge supplemental savings plan liability | [1] |  |  |  |  |  |  |  |  | (218.6) |  | 0.0 |  | 0.0 |
Net change in trading securities held by consolidated T. Rowe Price investment products | [1] |  |  |  |  |  |  |  |  | (1,492.9) |  | (1,297.9) |  | (7.5) |
Changes in accounts receivable and accrued revenue | [1] |  |  |  |  |  |  |  |  | (100.8) |  | (9.3) |  | (3.2) |
Changes in payables and accrued liabilities | [1] |  |  |  |  |  |  |  |  | 323.4 |  | 138.6 |  | 98.2 |
Other changes in assets and liabilities | [1] |  |  |  |  |  |  |  |  | (2.0) |  | (125.9) |  | 7.1 |
Net cash provided by (used in) operating activities | [1] |  |  |  |  |  |  |  |  | 229.5 |  | 170.5 |  | 1,530.5 |
Net cash provided by (used in) investing activities | [1] |  |  |  |  |  |  |  |  | 39.0 |  | 106.2 |  | 109.0 |
Net cash provided by (used in) financing activities | [1] |  |  |  |  |  |  |  |  | 461.5 |  | (176.4) |  | (1,973.3) |
Net subscriptions received from redeemable non-controlling interest holders | [1] |  |  |  |  |  |  |  |  | 1,281.6 |  | 915.0 |  | 0.0 |
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products | [1] |  |  |  |  |  |  |  |  | 5.3 |  | (2.1) |  | 0.0 |
Net change in cash and cash equivalents during period | [1] |  |  |  |  |  |  |  |  | 735.3 |  | 98.2 |  | (333.8) |
Cash and cash equivalents at beginning of year | [1] |  |  |  | 1,270.5 |  |  |  | 1,172.3 | 1,270.5 |  | 1,172.3 |  | 1,506.1 |
Cash and cash equivalents at end of year | [1] | 2,005.8 |  |  |  | 1,270.5 |  |  |  | 2,005.8 |  | 1,270.5 |  | 1,172.3 |
Consolidation eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | (98.2) |  | (69.1) |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization of property and equipment |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Realized gains on dispositions of available-for-sale sponsored investment portfolios |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Gains recognized upon transfer of an available-for-sale T. Rowe Price investment products to T. Rowe Price investment products held as trading |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Net gains recognized on investments |  |  |  |  |  |  |  |  |  | 98.2 |  | 69.1 |  |  |
Investments in T. Rowe Price mutual funds held as trading to economically hedge supplemental savings plan liability |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Net change in trading securities held by consolidated T. Rowe Price investment products |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Changes in accounts receivable and accrued revenue |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Changes in payables and accrued liabilities |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Other changes in assets and liabilities |  |  |  |  |  |  |  |  |  | (7.0) |  | (6.6) |  |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  | (7.0) |  | (6.6) |  |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  | 137.1 |  | 284.5 |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | (130.1) |  | (277.9) |  |  |
Net subscriptions received from redeemable non-controlling interest holders |  |  |  |  |  |  |  |  |  | (130.1) |  | (277.9) |  |  |
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Net change in cash and cash equivalents during period |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Cash and cash equivalents at beginning of year |  |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 |  | 0.0 |  |  |
Cash and cash equivalents at end of year |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 |  | 0.0 |  | 0.0 |
Attributable to T. Rowe Price Group [Member] | Reportable entities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 1,497.8 |  | 1,215.0 |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization of property and equipment |  |  |  |  |  |  |  |  |  | 143.6 |  | 133.4 |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 152.0 |  | 161.6 |  |  |
Realized gains on dispositions of available-for-sale sponsored investment portfolios |  |  |  |  |  |  |  |  |  | (83.1) |  | (53.0) |  |  |
Gains recognized upon transfer of an available-for-sale T. Rowe Price investment products to T. Rowe Price investment products held as trading |  |  |  |  |  |  |  |  |  | (23.6) |  | 0.0 |  |  |
Net gains recognized on investments |  |  |  |  |  |  |  |  |  | (147.9) |  | (100.1) |  |  |
Investments in T. Rowe Price mutual funds held as trading to economically hedge supplemental savings plan liability |  |  |  |  |  |  |  |  |  | (218.6) |  | 0.0 |  |  |
Net change in trading securities held by consolidated T. Rowe Price investment products |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Changes in accounts receivable and accrued revenue |  |  |  |  |  |  |  |  |  | (100.8) |  | (9.3) |  |  |
Changes in payables and accrued liabilities |  |  |  |  |  |  |  |  |  | 169.1 |  | 101.5 |  |  |
Other changes in assets and liabilities |  |  |  |  |  |  |  |  |  | 163.3 |  | (105.4) |  |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  | 1,551.8 |  | 1,343.7 |  |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  | (33.9) |  | (219.7) |  |  |
Net cash provided by (used in) financing activities | [1] |  |  |  |  |  |  |  |  | (820.1) |  | (1,091.4) |  |  |
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Net change in cash and cash equivalents during period |  |  |  |  |  |  |  |  |  | 697.8 |  | 32.6 |  |  |
Cash and cash equivalents at beginning of year |  |  |  |  | 1,204.9 |  |  |  | 1,172.3 | 1,204.9 |  | 1,172.3 |  |  |
Cash and cash equivalents at end of year |  | 1,902.7 |  |  |  | 1,204.9 |  |  |  | 1,902.7 |  | 1,204.9 |  | 1,172.3 |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 181.6 |  | 108.1 |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization of property and equipment |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Realized gains on dispositions of available-for-sale sponsored investment portfolios |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Gains recognized upon transfer of an available-for-sale T. Rowe Price investment products to T. Rowe Price investment products held as trading |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Net gains recognized on investments |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Investments in T. Rowe Price mutual funds held as trading to economically hedge supplemental savings plan liability |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Net change in trading securities held by consolidated T. Rowe Price investment products |  |  |  |  |  |  |  |  |  | (1,492.9) |  | (1,297.9) |  |  |
Changes in accounts receivable and accrued revenue |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  |  |
Changes in payables and accrued liabilities |  |  |  |  |  |  |  |  |  | 154.3 |  | 37.1 |  |  |
Other changes in assets and liabilities |  |  |  |  |  |  |  |  |  | (158.3) |  | (13.9) |  |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  | (1,315.3) |  | (1,166.6) |  |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  | (64.2) |  | 41.4 |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 1,411.7 |  | 1,192.9 |  |  |
Net subscriptions received from redeemable non-controlling interest holders |  |  |  |  |  |  |  |  |  | 1,411.7 |  | 1,192.9 |  |  |
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products |  |  |  |  |  |  |  |  |  | 5.3 |  | (2.1) |  |  |
Net change in cash and cash equivalents during period |  |  |  |  |  |  |  |  |  | 37.5 |  | 65.6 |  |  |
Cash and cash equivalents at beginning of year |  |  |  |  | $ 65.6 |  |  |  | $ 0.0 | 65.6 |  | 0.0 |  |  |
Cash and cash equivalents at end of year |  | $ 103.1 |  |  |  | $ 65.6 |  |  |  | $ 103.1 |  | $ 65.6 |  | $ 0.0 |
[1] | See note 15 for a supplementary consolidating cash flow schedule.

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