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SUPPLEMENTARY CONSOLIDATING CASH FLOW STATEMENT. (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]                      
Net income $ 386.6 $ 404.2 $ 390.0 $ 400.4 $ 366.8 $ 362.7 $ 211.2 $ 313.3 $ 1,581.2 [1] $ 1,254.0 [1] $ 1,223.0 [1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities                      
Depreciation and amortization of property and equipment [1]                 143.6 133.4 126.3
Stock-based compensation expense [1]                 152.0 161.6 149.0
Realized gains on dispositions of available-for-sale sponsored investment portfolios [1]                 (83.1) (53.0) (56.5)
Gains recognized upon transfer of an available-for-sale T. Rowe Price investment products to T. Rowe Price investment products held as trading [1]                 (23.6) 0.0 0.0
Net gains recognized on investments [1]                 (49.7) (31.0) (5.9)
Investments in T. Rowe Price mutual funds held as trading to economically hedge supplemental savings plan liability [1]                 (218.6) 0.0 0.0
Net change in trading securities held by consolidated T. Rowe Price investment products [1]                 (1,492.9) (1,297.9) (7.5)
Changes in accounts receivable and accrued revenue [1]                 (100.8) (9.3) (3.2)
Changes in payables and accrued liabilities [1]                 323.4 138.6 98.2
Other changes in assets and liabilities [1]                 (2.0) (125.9) 7.1
Net cash provided by (used in) operating activities [1]                 229.5 170.5 1,530.5
Net cash provided by (used in) investing activities [1]                 39.0 106.2 109.0
Net cash provided by (used in) financing activities [1]                 461.5 (176.4) (1,973.3)
Net subscriptions received from redeemable non-controlling interest holders [1]                 1,281.6 915.0 0.0
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products [1]                 5.3 (2.1) 0.0
Net change in cash and cash equivalents during period [1]                 735.3 98.2 (333.8)
Cash and cash equivalents at beginning of year [1]       1,270.5       1,172.3 1,270.5 1,172.3 1,506.1
Cash and cash equivalents at end of year [1] 2,005.8       1,270.5       2,005.8 1,270.5 1,172.3
Consolidation eliminations [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 (98.2) (69.1)  
Adjustments to reconcile net income to net cash provided by (used in) operating activities                      
Depreciation and amortization of property and equipment                 0.0 0.0  
Stock-based compensation expense                 0.0 0.0  
Realized gains on dispositions of available-for-sale sponsored investment portfolios                 0.0 0.0  
Gains recognized upon transfer of an available-for-sale T. Rowe Price investment products to T. Rowe Price investment products held as trading                 0.0 0.0  
Net gains recognized on investments                 98.2 69.1  
Investments in T. Rowe Price mutual funds held as trading to economically hedge supplemental savings plan liability                 0.0 0.0  
Net change in trading securities held by consolidated T. Rowe Price investment products                 0.0 0.0  
Changes in accounts receivable and accrued revenue                 0.0 0.0  
Changes in payables and accrued liabilities                 0.0 0.0  
Other changes in assets and liabilities                 (7.0) (6.6)  
Net cash provided by (used in) operating activities                 (7.0) (6.6)  
Net cash provided by (used in) investing activities                 137.1 284.5  
Net cash provided by (used in) financing activities                 (130.1) (277.9)  
Net subscriptions received from redeemable non-controlling interest holders                 (130.1) (277.9)  
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products                 0.0 0.0  
Net change in cash and cash equivalents during period                 0.0 0.0  
Cash and cash equivalents at beginning of year       0.0       0.0 0.0 0.0  
Cash and cash equivalents at end of year 0.0       0.0       0.0 0.0 0.0
Attributable to T. Rowe Price Group [Member] | Reportable entities [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 1,497.8 1,215.0  
Adjustments to reconcile net income to net cash provided by (used in) operating activities                      
Depreciation and amortization of property and equipment                 143.6 133.4  
Stock-based compensation expense                 152.0 161.6  
Realized gains on dispositions of available-for-sale sponsored investment portfolios                 (83.1) (53.0)  
Gains recognized upon transfer of an available-for-sale T. Rowe Price investment products to T. Rowe Price investment products held as trading                 (23.6) 0.0  
Net gains recognized on investments                 (147.9) (100.1)  
Investments in T. Rowe Price mutual funds held as trading to economically hedge supplemental savings plan liability                 (218.6) 0.0  
Net change in trading securities held by consolidated T. Rowe Price investment products                 0.0 0.0  
Changes in accounts receivable and accrued revenue                 (100.8) (9.3)  
Changes in payables and accrued liabilities                 169.1 101.5  
Other changes in assets and liabilities                 163.3 (105.4)  
Net cash provided by (used in) operating activities                 1,551.8 1,343.7  
Net cash provided by (used in) investing activities                 (33.9) (219.7)  
Net cash provided by (used in) financing activities [1]                 (820.1) (1,091.4)  
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products                 0.0 0.0  
Net change in cash and cash equivalents during period                 697.8 32.6  
Cash and cash equivalents at beginning of year       1,204.9       1,172.3 1,204.9 1,172.3  
Cash and cash equivalents at end of year 1,902.7       1,204.9       1,902.7 1,204.9 1,172.3
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 181.6 108.1  
Adjustments to reconcile net income to net cash provided by (used in) operating activities                      
Depreciation and amortization of property and equipment                 0.0 0.0  
Stock-based compensation expense                 0.0 0.0  
Realized gains on dispositions of available-for-sale sponsored investment portfolios                 0.0 0.0  
Gains recognized upon transfer of an available-for-sale T. Rowe Price investment products to T. Rowe Price investment products held as trading                 0.0 0.0  
Net gains recognized on investments                 0.0 0.0  
Investments in T. Rowe Price mutual funds held as trading to economically hedge supplemental savings plan liability                 0.0 0.0  
Net change in trading securities held by consolidated T. Rowe Price investment products                 (1,492.9) (1,297.9)  
Changes in accounts receivable and accrued revenue                 0.0 0.0  
Changes in payables and accrued liabilities                 154.3 37.1  
Other changes in assets and liabilities                 (158.3) (13.9)  
Net cash provided by (used in) operating activities                 (1,315.3) (1,166.6)  
Net cash provided by (used in) investing activities                 (64.2) 41.4  
Net cash provided by (used in) financing activities                 1,411.7 1,192.9  
Net subscriptions received from redeemable non-controlling interest holders                 1,411.7 1,192.9  
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products                 5.3 (2.1)  
Net change in cash and cash equivalents during period                 37.5 65.6  
Cash and cash equivalents at beginning of year       $ 65.6       $ 0.0 65.6 0.0  
Cash and cash equivalents at end of year $ 103.1       $ 65.6       $ 103.1 $ 65.6 $ 0.0
[1] See note 15 for a supplementary consolidating cash flow schedule.