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INVESTMENTS. (Dividends) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
T. Rowe Price investment products [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Dividend distribution | $ 36.0 | $ 19.2 | $ 15.8

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- Details
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