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CONTRIBUTING EMPLOYEE OWNERSHIP PLAN (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 6.7 | $ 7.0 | $ 22.0 | $ 22.4 |
Employer matching contributions to employee ownership plan | $ 3.9 | $ 3.0 | $ 11.3 | $ 8.7 |
Minimum |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation |  |  |  |  | 5.00%
Maximum |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation |  |  |  |  | 7.50%

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- Definition Contribution to an individual retirement account as a percentage of employee's eligible compensation. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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