Annual report pursuant to Section 13 and 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Transaction Gains (Losses) Resulting from Remeasurement) (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Transaction Gains (Losses) Resulting from Remeasurement) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Foreign Currency Transaction Gain (Loss), before Tax $ (2.7) $ 0.8 $ 3.3
Transaction Gains and Losses Resulting from Remeasurement [Member]      
Foreign Currency Transaction Gain (Loss), before Tax 11.4 (16.8) 16.3
Cash and Cash Equivalents [Member]      
Foreign Currency Transaction Gain (Loss), before Tax (2.5) (1.0) 1.5
Intercompany loan [Member]      
Foreign Currency Transaction Gain (Loss), before Tax $ 16.6 $ (16.6) $ 11.5