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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
Mar. 31, 2012
USD ($)
derivative_instrument
Derivative [Line Items]            
Total exposure to floating rate interest rates 1.00%   1.00%   1.00%  
Foreign Exchange Contract            
Derivative [Line Items]            
Notional amounts of foreign currency exchange contracts $ 57.0   $ 57.0      
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments (4.0) $ 1.7 (3.1) $ 2.2    
Intercompany Loans            
Derivative [Line Items]            
Gain (loss) due to the effect of foreign currency exchange rates on intercompany loans 4.9 (2.7) 3.7 (3.9)    
March 2012 Interest-Rate Swap Termination            
Derivative [Line Items]            
Number of interest-rate swap agreements terminated | derivative_instrument           2
Notional amount           $ 350.0
Deferred gain (loss) on discontinuation of interest rate fair value hedge           $ 46.1
Amortization of interest rate swap gains $ 1.3 $ 1.2 $ 6.0 $ 2.4