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INCOME TAXES. (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax provision related to the tax law changes | $ 20.8 | $ 71.1 | $ 20.8 |  |
Provisional income tax related to the tax law changes |  |  |  | $ 71.1 |
Income Tax Reform [Line Items] |  |  |  |  |
Unremitted earnings of foreign subsidiaries |  |  | 656.0 |  |
Tax refund receivables |  | 43.2 | 21.9 | 43.2 |
Net income taxes paid |  |  | 644.2 | 857.7 | $ 680.6
Net tax benefits reducing income tax provision |  |  | 40.6 | 75.5 | $ 31.6
Net interest payable related to unrecognized tax benefits |  | $ 1.5 | $ 1.2 | $ 1.5 |
State and local jurisdiction [Member] | Comptroller of Maryland [Member] |  |  |  |  |
Income Tax Reform [Line Items] |  |  |  |  |
Nonrecurring income tax charge due to Maryland state tax legislation | $ 7.9 |  |  |  |

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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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