UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Cash and cash equivalents at beginning of period	$ 1,495.3	$ 1,596.3	$ 2,005.8
Cash and cash equivalents at end of period	1,913.1	1,495.3	1,596.3
Consolidated T. Rowe Price investment products [Member]
Cash and cash equivalents at beginning of period	70.1	111.9	103.1
Cash and cash equivalents at end of period	$ 110.7	$ 70.1	$ 111.9

Cash and Cash Equivalents, at Carrying Value, Including Consolidated Sponsored Investment Portfolios

No definition available.

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Namespace Prefix:	trow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant