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) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities        
(Expenses incurred) insurance receivable recorded $ (46.1)      
Cybersecurity Incident        
Accrued Liabilities        
Beginning balance     $ (75.6)  
(Expenses incurred) insurance receivable recorded   $ (164.0) (20.4)  
Payments made (received)   88.4 83.3  
Ending balance (12.7) (75.6) (12.7) $ (75.6)
Insurance Receivable        
Beginning balance     35.0  
(Expenses incurred) insurance receivable recorded     75.0 50.0
Payments made (received)   (15.0) (110.0)  
Ending balance $ 0.0 $ 35.0 $ 0.0 $ 35.0