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Derivatives and Hedging (Details)
12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Jul. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Carrying amount of nonderivative instruments   $ 1,466,803,000   $ 1,506,400,000
Unrealized loss on net investment hedge   28,360,000    
Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount of nonderivative instruments | € € 700,000,000      
Carrying amount of nonderivative instruments   $ 801,010,000    
Cash Flow Hedging [Member] | Interest Rate Swap [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, amount of hedged item     $ 500,000,000  
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, amount of hedged item     $ 500,000,000