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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
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 |  | 1,902.7 |
Cash and cash equivalents at end of period |  | 1,681.4 |
Consolidation eliminations [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
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
Consolidated T. Rowe Price investment products [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash and cash equivalents at end of period |  | 84.8 | 50.2
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
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
Voting interest entities [Member] | Reportable entities [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities |  | (52.8) | (0.6)
Net cash provided by (used in) investing activities |  | 0.0 | (6.2)
Net cash provided by (used in) financing activities |  | 63.4 | 3.2
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 |  | 10.6 | (3.6)
Cash and cash equivalents at beginning of year |  | 7.1 | 10.3
Cash and cash equivalents at end of period |  | 17.7 | 6.7
Variable interest entities [Member] | Reportable entities [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities |  | (148.2) | (538.2)
Net cash provided by (used in) investing activities |  | (21.5) | (40.3)
Net cash provided by (used in) financing activities |  | 139.5 | 570.1
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 |  | (28.9) | (11.8)
Cash and cash equivalents at beginning of year |  | 96.0 | 55.3
Cash and cash equivalents at end of period |  | $ 67.1 | $ 43.5
[1] | See note 12 for a supplementary consolidating cash flow schedule.

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