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Financial Instruments and Fair Value Measurements - Derivative Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Feb. 29, 2020
USD ($)
derivative
May 31, 2019
GBP (£)
derivative
May 31, 2019
USD ($)
derivative
Treasury rate locks | Cash flow hedge          
Derivative [Line Items]          
Number of derivative instruments | derivative     5    
Aggregate notional amount     $ 500,000    
Cross-currency swaps | Cash flow hedge          
Derivative [Line Items]          
Number of derivative instruments | derivative       4 4
Aggregate notional amount       £ 130 $ 166,000
Cross-currency swaps | Foreign exchange gains          
Derivative [Line Items]          
Unrealized gains (losses) reclassified to income statement $ 11,400        
Cross-currency swap unrealized gains expected to be reclassified within next twelve months 2,100        
Interest rate swaps | Interest expense          
Derivative [Line Items]          
Unrealized gains (losses) reclassified to income statement (1,600) $ (678)      
Interest rate swaps and treasury locks | Interest expense          
Derivative [Line Items]          
Interest rate swap unrealized loss expected to be reclassified within next twelve months $ 12,000