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Fair Value of Financial Instruments - Derivatives (Details)
€ in Millions, £ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
GBP (£)
contract
Dec. 31, 2018
GBP (£)
contract
Dec. 31, 2018
EUR (€)
contract
Dec. 31, 2018
USD ($)
contract
Derivatives, Fair Value [Line Items]            
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | $ $ 1,000,000.0 $ 1,400,000        
Foreign currency contract, asset, fair value disclosure | $           $ 0
Forward Contracts            
Derivatives, Fair Value [Line Items]            
Derivative, number of instruments held | contract     4 2 2 2
Derivative, notional amount       £ 4.1 € 12.9  
Foreign Exchange Contract [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, number of instruments held | contract     26      
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract, Euro [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, notional amount     £ 9.0 16.0    
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract, Pound [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, notional amount     4.0 £ 6.3    
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Contract, Euro [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, notional amount     19.9      
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Contract, Pound [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, notional amount     £ 9.8