Annual report pursuant to Section 13 and 15(d)

Financial Instruments (Details)

v3.8.0.1
Financial Instruments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Senior Notes Due 2021 [Member]    
Derivative [Line Items]    
Interest Rate 4.625% 4.625%
Debentures Due 2023 [Member]    
Derivative [Line Items]    
Interest Rate 7.375% 7.375%
Foreign Exchange Forward [Member]    
Derivative [Line Items]    
Notional Values $ 312,600,000 $ 255,000,000
Foreign Exchange Option [Member]    
Derivative [Line Items]    
Notional Values 18,000,000 30,400,000
Foreign Exchange Contracts [Member]    
Derivative [Line Items]    
Cash Flow Hedge Gain (Loss) to be Reclassified Within Twelve Months (4,300,000)  
Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Values 200,000,000 200,000,000
Interest Rate Swap [Member] | Senior Notes Due 2021 [Member]    
Derivative [Line Items]    
Notional Values 150,000,000 150,000,000
Interest Rate Swap [Member] | Debentures Due 2023 [Member]    
Derivative [Line Items]    
Notional Values 50,000,000 50,000,000
Forward-Starting Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Values 0 0
Cash Flow Hedge Gain (Loss) to be Reclassified Within Twelve Months (900,000)  
Amount of Gain (Loss) Estimated to be Reclassified From Accumulated Other Comprehensive Loss to Cost of Sales or Interest Expense (3,400,000) (4,500,000)
Commodity Contracts [Member]    
Derivative [Line Items]    
Notional Values $ 0 $ 0
Minimum [Member]    
Derivative [Line Items]    
Term of Derivative Instruments (in Months) 1 month  
Maximum [Member]    
Derivative [Line Items]    
Term of Derivative Instruments (in Months) 18 months