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 6 Months Ended
Sep. 30, 2017
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Accrued Liabilities          
Beginning Balance $ 0.0 $ (27.5) $ (75.6) $ (87.5) $ (75.6)
(Expenses incurred) insurance receivable recorded (87.5) 0.0 (4.1) (76.5)  
Payments made (received) 0.0 17.8 52.2 88.4  
Ending Balance (87.5) (9.7) (27.5) (75.6) (9.7)
Insurance Receivable          
Beginning Balance 0.0 10.0 35.0 0.0 35.0
(Expenses incurred) insurance receivable recorded 0.0 35.0 10.0 50.0  
Payments made (received) 0.0 (45.0) (35.0) (15.0)  
Ending Balance $ 0.0 $ 0.0 $ 10.0 $ 35.0 $ 0.0