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OTHER DISCLOSURES. | 12 Months Ended
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Dec. 31, 2017
Other Disclosures [Abstract] |
OTHER DISCLOSURES. | OTHER DISCLOSURES. RETIREMENT PLANS. Compensation and related costs includes expense recognized for our defined contribution retirement plans of $74.9 million in 2015, $80.7 million in 2016, and $89.4 million in 2017. SUPPLEMENTAL SAVINGS PLAN. The Supplemental Savings Plan provides certain senior officers the opportunity to defer receipt of up to 100% of their cash incentive compensation earned for a respective calendar year during which services are provided. The amounts deferred are adjusted in accordance with the hypothetical investments chosen by the officer from a list of mutual funds. The officer can initially defer these amounts for a period of two to 15 years. For 2015, 2016 and 2017, senior officers elected to defer $72.8 million, $83.4 million, and $95.5 million, respectively.

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