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Derivative Instruments and Hedging Activities (Narrative) (Details)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
country
Dec. 31, 2017
USD ($)
Jan. 31, 2018
USD ($)
Jan. 31, 2018
EUR (€)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Derivative Instruments, Gain (Loss) [Line Items]            
Number of countries where products sold, countries (over 150) | country 150          
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Debt instrument, interest rate, percent 0.33%          
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, notional amount $ 191,400,000 $ 96,800,000        
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Foreign Exchange Contract [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, notional amount 363,300,000 374,200,000       € 312.0
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Cross Currency Interest Rate Contract, Payment [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, notional amount 286,100,000     € 245.7    
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Cross Currency Interest Rate Contract, Receipt [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, notional amount     $ 300,000,000      
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, notional amount         $ 300,000,000.0  
Deferred gain on hedge termination   7,300,000        
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, notional amount $ 1,588,700,000 $ 1,701,400,000