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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Jan. 01, 2018

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balances

$ 6,124.3

$ 5,824.4

$ 5,008.6

Balances, adjusted

$ 5,838.9

Other comprehensive income (loss)

(1.0)

(28.2)

(15.1)

Ending balances

7,102.1

6,124.3

5,824.4

Accounting standards update 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

^[1]

14.5

Net unrealized holding gains

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balances

0.0

7.9

52.2

Balances, adjusted

0.0

Other comprehensive income (loss) before reclassifications and income taxes

0.0

0.0

37.4

Reclassification adjustments recognized in non-operating income

0.0

0.0

(110.2)

Other comprehensive income (loss), before taxes

0.0

0.0

(72.8)

Net deferred tax benefits (income taxes)

0.0

0.0

28.5

Other comprehensive income (loss)

0.0

0.0

(44.3)

Ending balances

0.0

0.0

7.9

Net unrealized holding gains | Accounting standards update 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

(7.9)

Net unrealized holding gains | Accounting standards update 2018-02, currency translation adjustments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

0.0

Currency translation adjustments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balances

(42.0)

(11.5)

(40.7)

Balances, adjusted

(13.8)

Other comprehensive income (loss) before reclassifications and income taxes

(1.4)

(33.8)

47.8

Reclassification adjustments recognized in non-operating income

(0.1)

(3.6)

(0.1)

Other comprehensive income (loss), before taxes

(1.5)

(37.4)

47.7

Net deferred tax benefits (income taxes)

0.5

9.2

(18.5)

Other comprehensive income (loss)

(1.0)

(28.2)

29.2

Ending balances

(43.0)

(42.0)

(11.5)

Currency translation adjustments | Accounting standards update 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

0.0

Currency translation adjustments | Accounting standards update 2018-02, currency translation adjustments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

(2.3)

Currency translation adjustments | Equity method investments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balances

(48.8)

(30.6)

(32.3)

Balances, adjusted

(37.0)

Other comprehensive income (loss) before reclassifications and income taxes

2.4

(15.2)

2.6

Reclassification adjustments recognized in non-operating income

0.0

0.0

0.0

Other comprehensive income (loss), before taxes

2.4

(15.2)

2.6

Net deferred tax benefits (income taxes)

(0.5)

3.4

(0.9)

Other comprehensive income (loss)

1.9

(11.8)

1.7

Ending balances

(46.9)

(48.8)

(30.6)

Currency translation adjustments | Equity method investments | Accounting standards update 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

0.0

Currency translation adjustments | Equity method investments | Accounting standards update 2018-02, currency translation adjustments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

(6.4)

Currency translation adjustments | Consolidated T. Rowe Price investment products - variable interest entities

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balances

6.8

19.1

(8.4)

Balances, adjusted

23.2

Other comprehensive income (loss) before reclassifications and income taxes

(3.8)

(18.6)

45.2

Reclassification adjustments recognized in non-operating income

(0.1)

(3.6)

(0.1)

Other comprehensive income (loss), before taxes

(3.9)

(22.2)

45.1

Net deferred tax benefits (income taxes)

1.0

5.8

(17.6)

Other comprehensive income (loss)

(2.9)

(16.4)

27.5

Ending balances

3.9

6.8

19.1

Currency translation adjustments | Consolidated T. Rowe Price investment products - variable interest entities | Accounting standards update 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

0.0

Currency translation adjustments | Consolidated T. Rowe Price investment products - variable interest entities | Accounting standards update 2018-02, currency translation adjustments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

4.1

Total accumulated other comprehensive income

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balances

^[2]

(42.0)

(3.6)

11.5

Balances, adjusted

^[2]

(13.8)

Other comprehensive income (loss) before reclassifications and income taxes

(1.4)

(33.8)

85.2

Reclassification adjustments recognized in non-operating income

(0.1)

(3.6)

(110.3)

Other comprehensive income (loss), before taxes

(1.5)

(37.4)

(25.1)

Net deferred tax benefits (income taxes)

0.5

9.2

10.0

Other comprehensive income (loss)

^[2]

(1.0)

(28.2)

(15.1)

Ending balances

^[2]

(43.0)

(42.0)

(3.6)

Total accumulated other comprehensive income | Accounting standards update 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

^[1],[2]

(7.9)

Total accumulated other comprehensive income | Accounting standards update 2018-02, currency translation adjustments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

^[2]

(2.3)

Total accumulated other comprehensive income | Accounting standards update 2018-02, available for sale securities

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

^[1]

(1.7)

Retained earnings

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balances

5,464.1

4,932.9

4,293.6

Balances, adjusted

4,957.6

Ending balances

$ 6,443.5

$ 5,464.1

4,932.9

Retained earnings | Accounting standards update 2016-01

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

^[1]

22.4

Retained earnings | Accounting standards update 2018-02, currency translation adjustments

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

^[2]

$ 2.3

Retained earnings | Accounting standards update 2018-02, available for sale securities

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Cumulative effect of adopting new accounting guidance

$ 1.7

[1]	Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.
[2]	Accumulated other comprehensive income

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