Quarterly report pursuant to Section 13 or 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Income Tax Examination [Line Items]            
Federal tax rate         21.00% 31.50%
Effective Income Tax Rate Reconciliation, Percent (4.70%) 10.10% (1.40%) 10.10%    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 127.2   $ 127.2      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 109.0   109.0      
Income Tax Examination, Penalties and Interest Accrued 0.9   0.9      
Tax liability related to an settlement     1.6      
Deferred Tax Asset [Member]            
Income Tax Examination [Line Items]            
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 121.8   121.8      
Other Noncurrent Liabilities [Member]            
Income Tax Examination [Line Items]            
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 5.4   $ 5.4