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INVESTMENTS. (T. Rowe Price Investment Product - Available for Sale) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Aggregate cost | $ 587.2 | $ 626.2
Unrealized holding gains | 14.4 | 89.7
Unrealized holding losses | (4.5) | (6.9)
Aggregate fair value | 597.1 | 709.0
Stock and blended asset funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Aggregate cost | 106.7 | 162.9
Unrealized holding gains | 14.1 | 88.0
Unrealized holding losses | 0.0 | (1.9)
Aggregate fair value | 120.8 | 249.0
Bond funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Aggregate cost | 480.5 | 463.3
Unrealized holding gains | 0.3 | 1.7
Unrealized holding losses | (4.5) | (5.0)
Aggregate fair value | $ 476.3 | $ 460.0

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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