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Derivative Instruments and Hedging Activities (Narrative) (Details)
€ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
country
Dec. 31, 2016
USD ($)
Oct. 22, 2018
USD ($)
Jan. 31, 2018
USD ($)
Jan. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
EUR (€)
Derivative Instruments, Gain (Loss) [Line Items]              
Number of countries where products sold, countries (more than) | country 150            
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap contract              
Derivative Instruments, Gain (Loss) [Line Items]              
Derivative, notional amount $ 361,300,000           € 312.0
Debt instrument, interest rate, percent 0.33%            
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency contracts              
Derivative Instruments, Gain (Loss) [Line Items]              
Derivative, notional amount $ 109,300,000         $ 96,800,000  
Designated as Hedging Instrument | Net Investment Hedging | Foreign currency contracts              
Derivative Instruments, Gain (Loss) [Line Items]              
Derivative, notional amount 361,300,000         374,200,000  
Designated as Hedging Instrument | Net Investment Hedging | Cross Currency Interest Rate Contract, Payment              
Derivative Instruments, Gain (Loss) [Line Items]              
Derivative, notional amount 284,500,000       € 245.7    
Designated as Hedging Instrument | Net Investment Hedging | Cross Currency Interest Rate Contract, Receipt              
Derivative Instruments, Gain (Loss) [Line Items]              
Derivative, notional amount       $ 300,000,000      
Designated as Hedging Instrument | Fair Value Hedging | Interest rate swap contract              
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 | Foreign currency contracts              
Derivative Instruments, Gain (Loss) [Line Items]              
Derivative, notional amount $ 1,332,900,000         $ 1,701,400,000  
57/8% Senior notes due 2021              
Derivative Instruments, Gain (Loss) [Line Items]              
Debt instrument, interest rate, percent 5.875% 5.875%          
Interest expense, net | Subsequent Event | Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap contract              
Derivative Instruments, Gain (Loss) [Line Items]              
Interest Rate Derivatives, at Fair Value, Net     $ 3,900,000