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Financial Instruments (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Gain (loss) from the change in fair value of financial instruments $ 2,500,000 $ 0 $ (2,900,000)            
Notional amount   $ 387,200,000     $ 625,900,000        
Interest Rate Swap [Member] | Cash Flow Hedging [Member]                  
Derivative, maturity date Feb. 14, 2024                
Notional amount         314,400,000        
(Loss) gain to be reclassified during next 12 months, net         (3,700,000)        
Interest Rate Swap [Member] | Net Investment Hedging [Member]                  
Derivative, maturity date Feb. 14, 2024                
Notional amount | €       € 96,200,000          
Cross Currency Swaps [Member] | Cash Flow Hedging [Member]                  
Derivative, maturity date Feb. 14, 2024                
Notional amount         226,000,000.0        
(Loss) gain to be reclassified during next 12 months, net         $ 3,900,000        
Secured Term Loan [Member] | Interest Rate Swap [Member]                  
Debt amount issued             $ 150,000,000   $ 150,000,000
Secured Euro Term Loan [Member] | Interest Rate Swap [Member]                  
Debt amount issued | €           € 90,000,000   € 90,000,000