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CASH EQUIVALENTS.	12 Months Ended
	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
CASH EQUIVALENTS	CASH EQUIVALENTS. Cash equivalent investments in the T. Rowe Price money market mutual funds aggregate $1,052.3 million at December 31, 2016, and $1,726.4 million at December 31, 2017. Dividends earned on these investments totaled $.2 million in 2015, $.3 million in 2016, and $9.1 million in 2017.

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- Definition

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 305
-URI http://asc.fasb.org/topic&trid=2122426

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