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Derivative Instruments and Hedging Activities (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized in accumulated other comprehensive income that were included in the assessment of effectiveness $ (5.6) $ (11.5) $ 56.1
Reclassification of losses (gains) from accumulated other comprehensive income to net income (loss) 10.3 6.1 (39.1)
Foreign Exchange Contract [Member] | Other Income [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized gains (losses) in consolidated statement of operations 0.1 (1.6) (0.9)
Commodity Contract [Member] | Natural Gas [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) before tax expected to be reclassified into earnings within the next twelve months 5.1    
Commodity Contract [Member] | Electricity [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) before tax expected to be reclassified into earnings within the next twelve months 2.7    
Commodity Contract [Member] | Zinc [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) before tax expected to be reclassified into earnings within the next twelve months (4.8)    
Commodity Contract [Member] | Cost of Products Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized gains (losses) in consolidated statement of operations (2.4) 31.6 38.6
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized in accumulated other comprehensive income that were included in the assessment of effectiveness (5.4) 0.0 0.0
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Cost of Products Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Reclassification of losses (gains) from accumulated other comprehensive income to net income (loss) (0.9) 0.0 0.0
Cash Flow Hedging [Member] | Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized in accumulated other comprehensive income that were included in the assessment of effectiveness (0.2) (11.5) 56.1
Cash Flow Hedging [Member] | Commodity Contract [Member] | Cost of Products Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Reclassification of losses (gains) from accumulated other comprehensive income to net income (loss) 11.2 $ 6.1 $ (39.1)
Canada, Dollars | Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) before tax expected to be reclassified into earnings within the next twelve months $ (1.5)