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SUPPLEMENTARY CONSOLIDATING CASH FLOW STATEMENT. (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | [1] | $ 455.5 | $ 400.4
Adjustments to reconcile net income to net cash provided by (used in) operating activities |  |  |
Depreciation and amortization of property and equipment | [1] | 36.9 | 35.6
Stock-based compensation expense | [1] | 45.6 | 36.8
Net gains recognized on other investments | [1] | (2.6) | (62.0)
Investments in U.S. mutual funds held as trading to economically hedge supplemental savings plan liability | [1] | (12.9) | 0.0
Net change in trading securities held by consolidated T. Rowe Price investment products | [1] | (189.4) | (566.3)
Other changes in assets and liabilities | [1] | 187.9 | 344.0
Net cash provided by (used in) operating activities | [1] | 521.0 | 188.5
Net cash provided by (used in) investing activities | [1] | (519.8) | 29.4
Net cash provided by (used in) financing activities | [1] | (242.1) | 146.0
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products | [1] | 1.3 | (3.4)
Net change in cash and cash equivalents during period | [1] | (239.6) | 360.5
Cash and cash equivalents at beginning of year | [1] | 2,005.8 | 1,270.5
Cash and cash equivalents at end of period | [1] | 1,766.2 | 1,631.0
Consolidation eliminations [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income |  | 3.5 | (31.8)
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
Net gains recognized on other investments |  | (3.5) | 31.8
Investments in U.S. 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
Other changes in assets and liabilities |  | (0.9) | (0.8)
Net cash provided by (used in) operating activities |  | (0.9) | (0.8)
Net cash provided by (used in) investing activities |  | 26.0 | 23.0
Net cash provided by (used in) financing activities |  | (25.1) | (22.2)
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
Cash and cash equivalents at end of period |  | 0.0 | 0.0
Attributable to T. Rowe Price Group [Member] | Reportable entities [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income |  | 453.7 | 385.9
Adjustments to reconcile net income to net cash provided by (used in) operating activities |  |  |
Depreciation and amortization of property and equipment |  | 36.9 | 35.6
Stock-based compensation expense |  | 45.6 | 36.8
Net gains recognized on other investments |  | 0.9 | (93.8)
Investments in U.S. mutual funds held as trading to economically hedge supplemental savings plan liability |  | (12.9) | 0.0
Net change in trading securities held by consolidated T. Rowe Price investment products |  | 0.0 | 0.0
Other changes in assets and liabilities |  | 198.7 | 363.6
Net cash provided by (used in) operating activities |  | 722.9 | 728.1
Net cash provided by (used in) investing activities |  | (524.3) | 52.9
Net cash provided by (used in) financing activities |  | (419.9) | (405.1)
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 |  | (221.3) | 375.9
Cash and cash equivalents at beginning of year |  | 1,902.7 | 1,204.9
Cash and cash equivalents at end of period |  | 1,681.4 | 1,580.8
Attributable to consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income |  | (1.7) | 46.3
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
Net gains recognized on other investments |  | 0.0 | 0.0
Investments in U.S. 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 |  | (189.4) | (566.3)
Other changes in assets and liabilities |  | (9.9) | (18.8)
Net cash provided by (used in) operating activities |  | (201.0) | (538.8)
Net cash provided by (used in) investing activities |  | (21.5) | (46.5)
Net cash provided by (used in) financing activities |  | 202.9 | 573.3
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products |  | 1.3 | (3.4)
Net change in cash and cash equivalents during period |  | (18.3) | (15.4)
Cash and cash equivalents at beginning of year |  | 103.1 | 65.6
Cash and cash equivalents at end of period |  | $ 84.8 | $ 50.2
[1] | See note 12 for a supplementary consolidating cash flow schedule.

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