Annual report pursuant to Section 13 and 15(d)

QUARTERLY RESULTS OF OPERATIONS (Details)

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QUARTERLY RESULTS OF OPERATIONS (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                   25,300,000  
Antidilutive Incremental Common Shares Excluded and Attributable to Share-based Payment Arrangements 0 0 0 4,600,000 0 3,000,000 0 0      
Income Tax Expense (Benefit)                 $ (252.4) $ (12.2) $ 169.3
Impairment of other long-lived assets                 $ 0.0 $ 0.0 $ 3.3