Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES - Business Insurance Recoveries (Details)

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COMMITMENTS AND CONTINGENCIES - Business Insurance Recoveries (Details) - Cybersecurity Incident - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 7 Months Ended
Sep. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Accrued Liabilities        
Beginning Balance $ 0.0 $ (75.6) $ (87.5)  
(Expenses incurred) insurance receivable recorded (87.5) (4.1) (76.5)  
Payments made (received) 0.0 52.2 88.4  
Ending Balance (87.5) (27.5) (75.6) $ (27.5)
Insurance Receivable        
Beginning Balance 0.0 35.0 0.0  
(Expenses incurred) insurance receivable recorded 0.0 10.0 50.0  
Payments made (received) 0.0 (35.0) (15.0) (50.0)
Ending Balance $ 0.0 $ 10.0 $ 35.0 $ 10.0