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Financial Instruments (Narrative) (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Gain (loss) from the change in fair value of financial instruments $ 3.6 $ (1.6) $ 4.0 $ (1.6)    
Notional amount 554.6   $ 554.6     $ 625.9
Interest Rate Swap [Member] | Cash Flow Hedging [Member]            
Derivative, maturity date     Feb. 14, 2024      
Notional amount 312.0   $ 312.0      
Net loss to be reclassified during next 12 months, net 8.4   $ 8.4      
Cross Currency Swaps [Member] | Cash Flow Hedging [Member]            
Derivative, maturity date     Feb. 14, 2024      
Notional amount 224.3   $ 224.3      
Net gain to be reclassified during next 12 months, net $ 0.3   $ 0.3      
Cross Currency Swaps [Member] | Net Investment Hedging [Member]            
Derivative, maturity date     Feb. 14, 2024      
Notional amount | €         € 95.5