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FAIR VALUE MEASUREMENTS. (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Fair value measurements summary | The following table summarizes our investments that are recognized in our unaudited condensed consolidated balance sheets using fair value measurements determined based on the differing levels of inputs. This table excludes investments held by the consolidated T. Rowe Price investment products which are presented separately on our unaudited condensed consolidated balance sheets and are detailed in Note 5.
| 3/31/2019 |  | 12/31/2018
(in millions) | Level 1 |  | Level 2 |  | Level 1 |  | Level 2
Cash equivalents held in T. Rowe Price money market funds | $ | 1,398.3 |  |  | $ | — |  |  | $ | 1,196.0 |  |  | $ | — |
T. Rowe Price investment products | 1,964.1 |  |  | 7.5 |  |  | 1,900.5 |  |  | 19.2 |
Total | $ | 3,362.4 |  |  | $ | 7.5 |  |  | $ | 3,096.5 |  |  | $ | 19.2 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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