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Derivative Instruments and Hedging Activities (Narrative) (Details)
€ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
country
Dec. 31, 2016
USD ($)
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]        
Derivative, notional amount $ 368,100,000     € 312.0
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 $ 107,400,000 $ 111,200,000    
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 5,600,000 7,300,000    
Derivative, variable interest rate     4.14% 4.14%
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount $ 1,391,600,000 $ 1,550,200,000