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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Reclassification Adjustments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Non-operating income |  | $ (124.5) | $ (34.1) | $ (327.3) | $ (50.2) |
Provision for income taxes |  | 183.7 | 169.2 | 365.0 | 313.6 |
Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Non-operating income |  | (0.1) | (0.5) | (0.2) | (3.6) |
Provision for income taxes |  | 0.0 | 0.1 | 0.0 | 0.9 |
Equity method investments [Member] | Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Non-operating income |  | 0.0 | 0.0 | 0.0 | 0.0 |
Variable interest entities [Member] | Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Non-operating income |  | $ (0.1) | $ (0.5) | $ (0.2) | $ (3.6) |
Accounting standards update 2016-01 [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [1] |  |  |  |  | $ 14.5
Accounting standards update 2016-01 [Member] | Retained earnings [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [1] |  |  |  |  | 22.4
Accounting standards update 2016-01 [Member] | Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [1],[2] |  |  |  |  | (7.9)
Accounting standards update 2016-01 [Member] | Reclassification out of accumulated other comprehensive income [Member] | Retained earnings [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  |  |  |  |  | 7.9
Accounting standards update 2016-01 [Member] | Reclassification out of accumulated other comprehensive income [Member] | Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  |  |  |  |  | (7.9)
Accounting standards update 2018-02, available for sale securities [Member] | Retained earnings [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  |  |  |  |  | 1.7
Accounting standards update 2018-02, available for sale securities [Member] | Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  |  |  |  |  | (1.7)
Accounting standards update 2018-02, available for sale securities [Member] | Reclassification out of accumulated other comprehensive income [Member] | Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |
Reclassification adjustment out of accumulated other comprehensive income |  |  |  |  |  |
Cumulative effect adjustment upon adoption of 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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