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FINANCIAL INSTRUMENTS AND DERIVATIVES - ADDITIONAL INFORMATION (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Mar. 11, 2019
USD ($)
Dec. 31, 2018
Derivative [Line Items]            
Cash received on derivatives contracts $ 34,500,000 $ 3,700,000        
Cash Flow Hedging | Designated as Hedging Instrument            
Derivative [Line Items]            
Notional amount       $ 473,300,000    
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument            
Derivative [Line Items]            
Notional amount       150,000,000.0    
Cash Flow Hedging | T-Lock            
Derivative [Line Items]            
Notional amount         $ 150,000,000.0  
Net Investment Hedging | Interest rate swaps | Designated as Hedging Instrument            
Derivative [Line Items]            
Notional amount | €     € 263,400,000      
Amount terminated | €     € 245,600,000      
Cash received on derivatives contracts $ 17,400,000          
Fixed Rate Senior Notes | Fixed Rate Senior Notes Due August 2021            
Derivative [Line Items]            
Long-term debt       $ 295,700,000    
Long-term debt, percentage bearing fixed interest     1.20% 1.20%   4.10%