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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash provided by operating activities | $ 578.7 | $ 521.0
Net cash used in investing activities | (33.8) | (519.8)
Net cash used in financing activities | (306.0) | (242.1)
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products | (0.7) | 1.3
Net change in cash and cash equivalents during period | 238.2 | (239.6)
Cash and cash equivalents at beginning of period | 1,495.3 | 2,005.8
Cash and cash equivalents at end of period | 1,733.5 | 1,766.2
Consolidation eliminations [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash used in financing activities | (37.8) | (25.1)
Consolidated T. Rowe Price investment products [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Cash and cash equivalents at beginning of period | 70.1 | 103.1
Cash and cash equivalents at end of period | 76.1 | 84.8
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash provided by operating activities | (93.7) | (201.0)
Net cash used in investing activities | (3.4) | (21.5)
Net cash used in financing activities | 103.8 | 202.9
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products | (0.7) | 1.3
Net change in cash and cash equivalents during period | 6.0 | (18.3)
Cash and cash equivalents at beginning of period | 103.1 | 70.1
Cash and cash equivalents at end of period | 84.8 | 76.1
Voting interest entities [Member] | Reportable entities [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash provided by operating activities | (28.7) | (52.8)
Net cash used in investing activities | (5.1) | 0.0
Net cash used in financing activities | 31.6 | 63.4
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 | (2.2) | 10.6
Cash and cash equivalents at beginning of period | 7.1 | 18.5
Cash and cash equivalents at end of period | 17.7 | 16.3
Variable interest entities [Member] | Reportable entities [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash provided by operating activities | (65.0) | (148.2)
Net cash used in investing activities | 1.7 | (21.5)
Net cash used in financing activities | 72.2 | 139.5
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products | (0.7) | 1.3
Net change in cash and cash equivalents during period | 8.2 | (28.9)
Cash and cash equivalents at beginning of period | 96.0 | 51.6
Cash and cash equivalents at end of period | $ 67.1 | $ 59.8

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