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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash provided by operating activities | $ 948.8 | $ 929.3
Net cash used in investing activities | (29.1) | (944.0)
Net cash used in financing activities | (501.5) | (388.2)
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products | (0.4) | (6.6)
Net change in cash and cash equivalents during period | 417.8 | (409.5)
Cash and cash equivalents at beginning of period | 1,495.3 | 2,005.8
Cash and cash equivalents at end of period | 1,913.1 | 1,596.3
Consolidation eliminations [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash used in financing activities | 146.9 | 115.6
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 | 110.7 | 111.9
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash provided by operating activities | (291.1) | (396.5)
Net cash used in investing activities | (5.1) | (21.7)
Net cash used in financing activities | 337.2 | 433.6
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products | (0.4) | (6.6)
Net change in cash and cash equivalents during period | 40.6 | 8.8
Cash and cash equivalents at beginning of period | 70.1 | 103.1
Cash and cash equivalents at end of period | 110.7 | 111.9
Voting interest entities [Member] | Reportable entities [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash provided by operating activities | (32.7) | (38.1)
Net cash used in investing activities | (5.1) | 0.0
Net cash used in financing activities | 34.5 | 57.1
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 | (3.3) | 19.0
Cash and cash equivalents at beginning of period | 18.5 | 7.1
Cash and cash equivalents at end of period | 15.2 | 26.1
Variable interest entities [Member] | Reportable entities [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Net cash provided by operating activities | (258.4) | (358.4)
Net cash used in investing activities | 0.0 | (21.7)
Net cash used in financing activities | 302.7 | 376.5
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products | (0.4) | (6.6)
Net change in cash and cash equivalents during period | 43.9 | (10.2)
Cash and cash equivalents at beginning of period | 51.6 | 96.0
Cash and cash equivalents at end of period | $ 95.5 | $ 85.8

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