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Derivatives and Hedging (Details)
€ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Feb. 28, 2019
USD ($)
Jul. 31, 2018
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Net investment hedge, net of tax $ (7,716,000) $ 32,755,000   $ 3,730,000 $ 16,045,000    
Designated as Hedging Instrument              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Notional amount of nonderivative instruments | €     € 700,000        
Unsecured long-term debt, noncurrent $ 795,900,000     $ 795,900,000      
Cash Flow Hedging | Interest Rate Swap              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Derivative, amount of hedged item           $ 300,000,000 $ 500,000,000
Cash Flow Hedging | Cross Currency Interest Rate Contract              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Derivative, amount of hedged item           $ 800,000,000 $ 500,000,000