Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL DATA (UNAUDITED) - Narrative (Details)

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QUARTERLY FINANCIAL DATA (UNAUDITED) - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Data [Line Items]          
Loss contingency, loss in period $ 46.1        
Tax Cuts and Jobs Act of 2017, income tax benefit   $ (48.3)      
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services          
Quarterly Financial Data [Line Items]          
Loss contingency, loss in period     $ 113.3 $ 326.2 $ 114.0