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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Other Expense (Income) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
BASIS OF PRESENTATION        
Derivative liability adjustment fo embedded conversion feature in the Convertible Notes due 2024 $ 54.1   $ 54.1  
Loss on GBP forward contract     0.4  
Foriegn currency transactions (gain) losses   $ 0.4 (1.1) $ 3.2
Non-operating components of net periodic benefit cost   0.2 0.1 0.4
Loss on extinguishment of Bridge Loan       0.4
Fees related to modification of term loans 0.4   0.4 1.0
Other (0.4) (0.2) 1.4 (0.5)
Other expense (income) $ 54.1 $ (0.4) $ 57.5 $ (1.9)