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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

X

- 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

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

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