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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]      
Effects of cash flow hedges $ 0.1 $ 3.4 $ (1.7)
Cash Flow Hedges [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Cost of Sales [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Derivatives, Fair Value [Line Items]      
Effects of cash flow hedges 0.2    
Foreign Exchange Contract [Member]      
Derivatives, Fair Value [Line Items]      
Derivative amount 95.9 89.8  
Realized and unrealized foreign currency transaction gain (loss) $ 0.7 $ (1.5) $ (3.1)