Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Business Insurance Recoveries) (Details)

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COMMITMENTS AND CONTINGENCIES (Business Insurance Recoveries) (Details) - Cybersecurity Incident
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Accrued Liabilities    
(Expenses incurred) $ (164.0)  
Payments made 88.4  
Accrued Liabilities (75.6) $ (75.6)
Insurance Receivable    
Insurance receivable recorded 50.0  
(Payments received) (15.0) (15.0)
Insurance Receivable $ 35.0 $ 35.0