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FAIR VALUE MEASUREMENTS. (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Fair value measurements summary | The following table summarizes our investments that are recognized in our condensed consolidated balance sheets using fair value measurements determined based on the differing levels of inputs. This table excludes investments held by consolidated T. Rowe Price investment products which are presented separately on our condensed consolidated balance sheets and are detailed in Note 5.
| 12/31/17 |  | 3/31/18
(in millions) | Level 1 |  | Level 2 |  | Level 1 |  | Level 2
Cash equivalents | $ | 1,726.4 |  |  | $ | — |  |  | $ | 1,488.9 |  |  | $ | — |
T. Rowe Price investment products(1) | 942.9 |  |  | 17.4 |  |  | 1,496.4 |  |  | 18.0 |
Total | $ | 2,669.3 |  |  | $ | 17.4 |  |  | $ | 2,985.3 |  |  | $ | 18.0 |
(1) Includes $597.1 million of investments at December 31, 2017 that were previously reported as available-for sale investments prior to the adoption of new financial instruments guidance on January 1, 2018. Refer to Note 1 for more information.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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