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BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (New Accounting Guidance and Tax Reform) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Available for sale |  |  | $ 597.1 |  |  |
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accounting guidance | $ 2.3 |  |  |  |  |
Income tax provision related to the tax law changes |  | $ 20.8 | $ 71.1 | $ 20.8 |  |
State and local jurisdiction [Member] | Comptroller of Maryland [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Nonrecurring income tax charge due to Maryland state tax legislation |  | $ 7.9 |  |  |  |
ASU 2016-01, adjustment for fair value [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Increase in investment carrying value | 19.5 |  |  |  |  |
Increase in deferred taxes | 5.0 |  |  |  |  |
ASU 2016-02 [Member] | Forecast [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Right of use asset on operating lease |  |  |  |  | $ 140.0 |
Operating lease liability |  |  |  |  | $ 170.0 |
AOCI [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance |  |  |  |  |  | $ (32.5)
AOCI [Member] | ASU 2016-01 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance | 7.9 |  |  |  |  |
Retained earnings [Member] | ASU 2016-01, adjustment for fair value [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance | 14.5 |  |  |  |  |
Retained earnings [Member] | ASU 2016-01 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance | $ 7.9 |  |  |  |  |

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