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OTHER DISCLOSURES. (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Expense recognized for defined contribution retirement plans | $ 89.4 | $ 80.7 | $ 74.9
Senior officers [Member] | Supplemental Savings Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Supplemental Savings Plan, minimum deferral period | 2 years |  |
Supplemental Savings Plan, maximum deferral period | 15 years |  |
Amount of cash incentive compensation senior officers elected to defer | $ 95.5 | $ 83.4 | $ 72.8
Maximum [Member] | Senior officers [Member] | Supplemental Savings Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Deferral percentage of cash incentive compensation | 100.00% |  |

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