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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) $ in Millions | 3 Months Ended
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Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |
Provisional income tax benefit related to 2017 US Tax Reform Act | $ 158.7

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- Definition Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) + References No definition available. + Details
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