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INVESTMENTS. (Unrealized Losses on Available-For-Sale T. Rowe Price Investment Portfolios) (Details) $ in Millions | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
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Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Number of holdings with unrealized holding losses less than 12 months (number of securities) | security | 2 | 8
Number of holdings with unrealized holding losses 12 months or more (number of securities) | security | 2 | 2
Total number of holdings with unrealized holding losses (number of securities) | security | 4 | 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Unrealized holding losses of holdings that were in a continuous loss for less than 12 months | $ (0.4) | $ (4.2)
Unrealized holding losses of holdings that were in a continuous loss for 12 months or more | (4.1) | (2.7)
Total unrealized holding losses of holdings that were in a continuous loss | (4.5) | (6.9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Aggregate fair value of holdings with unrealized holding losses for less than 12 months | 213.2 | 328.1
Aggregate fair value of holdings with unrealized holding losses for 12 months or more | 191.5 | 169.5
Total aggregate fair value of holdings with unrealized holding losses | $ 404.7 | $ 497.6

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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